RELEASE NOTES for Perl version of Sisimai
===================================================================================================
- releases: "https://github.com/sisimai/p5-sisimai/releases"
- download: "https://metacpan.org/pod/Sisimai"
- document: "https://libsisimai.org/"

v5.2.0
---------------------------------------------------------------------------------------------------
- release: "Tue, 25 Feb 2025 11:05:09 +0900 (JST)"
- version: "5.2.0"
- changes:
  - **Keep compatibility with the Go language version of Sisimai** #547 #558 #567
    - **BREAKING CHANGES AT EXTERNAL USER APIs**
        - Changes in accessors of `Sisimai::Fact` and key names in JSON string
          - `smtpagent` has been renamed to `decodedby` #548
          - `smtpcommand` has been renamed to `command` #548
          - Removed accessors/keys are still available until v5.5.0
          - New accessor and key `feedbackid`, it is a field for the `Feedback-ID:` header of the
            original message #568
        - New bounce reason `Sisimai::Reason::Suppressed`
        - New bounce reason `Sisimai::Reason::FailedSTARTTLS` #562
    - **THERE ARE SOME BREAKING CHANGES AT INTERNAL APIs**
    - `Sisimai::SMTP::Error` has been renamed to `Sisimai::SMTP::Failure` and the following methods
      implemented: #542
      - `is_temporary()`
      - `is_hardbounce()`
      - `is_softbounce()`
      - `soft_or_hard()` has been removed
    - Changes in `Sisimai::Rhost` 
      - `get()` method has been renamed to `find()`
      - Fix bug in code to check the domain part of an email address as a remote hostname
      - Add a new error message pattern: `hosted tenant which has no mail-enabled subscriptions'`
        in `Sisimai::Rhost::Microsoft`
      - Implement `name()` method
      - Bug fix in `Sisimai::Rhost::Facebook`
    - Remove `hardbounce` accessor from `Sisimai::Lhost` #555
    - Implement `Sisimai::RFC3464::ThirdParty`
    - Remove the following MTA modules from `Sisimai::Lhost` #557
      - `Sisimai::RFC3464` can decode a bounce mail returned from services/MTAs below #551
        - Amavis
        - AmazonWorkMail
        - Aol
        - Barracuda
        - Bigfoot
        - Facebook #545
        - McAfee
        - MessageLabs
        - Outlook
        - PowerMTA
          - Some codes for checking heaaders have been moved to `Sisimai::RFC3464::ThirdParty`
        - ReceivingSES
        - SendGrid
        - SurfControl
        - X5
        - Yandex
      - `Sisimai::Lhost::Exim` can decode a bounce mail returned from services/MTAs below
        - MailRu
        - MXLogic
      - `Sisimai::Lhost::qmail` can decode a bounce mail returned from services/MTAs below
        - X4
        - Yahoo
      - `Sisimai::Lhost::Exchange2007` can decode a bounce mail returned from Office365 #553
    - `Sisimai::Lhost::GSuite` has been renamed to `Sisimai::Lhost::GoogleWorkspace`
    - `Sisimai::Lhost::AmazonSES` decodes only JSON formatted bounce mail notified from Amazon SNS
      - The bounce mail from Amazon SES which have no JSON string is decoded by `Sisimai::RFC3464`
    - Each error code table of the following MTA modules (removed at issue #557) have been moved to 
      `Sisimai::Rhost::*` #559
      - Aol
      - Facebook
      - GSuite
      - MessageLabs
      - Outlook
    - `Sisimai::MDA` has been renamed to `Sisimai::LDA`
    - `Sisimai::RFC791` for the IPv4 address implemented #560
      - `Sisimai::String->ipv4` has been moved/renamed to `Sisimai::RFC791->find`
      - Implement `Sisimai::RFC791->is_ipv4address`
    - `Sisimai::RFC1123->is_validhostname()` has been renamed to `is_internethost()`
    - Implement `Sisimai::RFC1123->find()`
    - #552 `Sisimai::RFC1894->field()` method detect a comment string (returns an array which have
      5 elements: ["field-name", "value-type", "value", "field-group", "comment"])
    - `Reporting-MTA` indicates `lhost` in `Sisimai::RFC1894` (bug fix)
  - Code improvement and bug fix at `Sisimai::Lhost::Exim`
    - Remove needless condition for getting error messages
    - Rewrite code for getting an SMTP reply code and a delivery status code
  - Warn if `Sisimai::Message->load` was called #537 #538
  - Remove unused method `Sisimai::Order->default` #539
  - Fix bug in `Sisimai::Message->tidy()` method #540
  - Code improvement in `Sisimai::RFC5322` and `Sisimai::ARF`
  - Fix the minimum and the maximum SMTP Reply code: 221 and 557 in `Sisimai::SMTP::Reply`
  - The first argument need not to be a reference at `Sisimai::SMTP::Transcript->rise()`
  - Fix typo in `Sisimai::RFC1894` (X-Actual-Recipient)
  - Fix bug in `Sisimai::Message->tidy()`: `;` is missing when the value of `Diagnostic-Code` field
    has multiple lines, And large scale code improvements.
  - Fix bug in `Sisimai::Reason::VirusDetected->true()`; fix `HELO` with `EHLO`
  - Add a new error message pattern in the followings:
    - `Sisimai::Reason::BadReputation`
    - `Sisimai::Reason::Blocked`
    - `Sisimai::Reason::Filtered`
    - `Sisimai::Reason::MailboxFull`
    - `Sisimai::Reason::MesgTooBig`
    - `Sisimai::Reason::RequirePTR`
    - `Sisimai::Reason::SpamDetected`
    - `Sisimai::Reason::SystemError`
  - Remove regular expressions from error message patterns at the following classes: #543
    - `Sisimai::Reason::Blocked`
    - `Sisimai::Reason::MailerError`
    - `Sisimai::Reason::SpamDetected`
  - Fix typo in `Sisimai::Rhost::YahooInc` Thanks to @bohwaz #546
  - Bug fix: Unstable matching for getting an `Sisimai::Rhost::*` module name when the bounce mail
    sent from Microsoft to Aol (Random key sort order of the Hash)
  - Add `sv-SE` in `Sisimai::Lhost::Exchange2007`
  - Large scale code improvement in `Sisimai::Lhost::V5sendmail`

v5.1.0
---------------------------------------------------------------------------------------------------
- release: "Mon,  1 Jul 2024 12:02:22 +0900 (JST)"
- version: "5.1.0"
- changes:
  - #531 #535 Remove v4 compatible features
    - `Sisimai->make()`
    - `Sisimai::Fact->softbounce()`
  - #478 #526 Implemenet `Sisimai::Lhost::DragonFly`
    - Add 30 sample emails generated by DMA: DrangonFly Mail Agent (lhost-dragonfly-*.eml)
  - #523 Consolidate error messages scattered under `Sisimai::Reason::*` into `Sisimai::Rhost::*`
    classes for each email service
    - `Sisimai::Rhost::YahooInc` for https://senders.yahooinc.com/smtp-error-codes/
    - `Sisimai::Rhost::Apple` for iCloud Mail
    - The following sample emails in `set-of-emails/maildir/bsd`:
      - 3 sample emails (rhost-yahooinc-0[1-3].eml)
      - 4 sample emails (rhost-apple-0[1-4].eml)
  - #524 #525 #529 Sisimai::Rhost improvements
    - Update the error code list and error message patterns in the following classes:
        - `Sisimai::Rhost::Cox`
        - `Sisimai::Rhost::FrancePTT`
        - `Sisimai::Rhost::GoDaddy`
        - `Sisimai::Rhost::Mimecast`
        - `Sisimai::Rhost::Spectrum`
        - `Sisimai::Rhost::Tencent`
    - Each error message should be compared with the lowercased string 
    - Follow any updates of the SMTP error code and message list in each email services related to
      `AuthFailure`, `BadReputation`, `RequirePTR`, and other error reasons added at v5
    - No longer needed method `Sisimai::Rhost->match' has been removed
  - #339 #530 Add 8 sample emails (lhost-opensmtpd-1[0-7].eml)generated by OpenSMTPD 6.8.0p2
  - #331 #532 Add 9 sample emails (lhost-qmail-1[1-9].eml) generated by notqmail 1.08
  - #209 #220 Add 6 sample emails (lhost-qmail-2[0-5].eml) generated by indimail 3.0.7 #533
  - Sisimai works on Perl 5.40.0 ef8d1f8

v5.0.3
---------------------------------------------------------------------------------------------------
- release: "Wed, 22 May 2024 14:00:22 +0900 (JST)"
- version: "5.0.3"
- changes:
  - Declare `use v5.26;` at each file using the postfix dereference #511
    - Replace `use feature ":5.10";` with `use v5.26;`
    - https://www.cpantesters.org/cpan/report/4a49b2fa-e101-11ee-9c91-c03a6e8775ea (Slaven Rezić)
    - https://www.cpantesters.org/cpan/report/8345bf54-e192-11ee-bcdd-1845aa8c77b5 (David Cantrell)
    - https://www.cpantesters.org/cpan/report/3170e9aa-e526-11ee-98b0-b3c3213a625c (Chris Williams)
    - https://www.cpantesters.org/cpan/report/e51d7d7a-e58e-11ee-922b-530cbea18e0e (Andreas J. König)
  - Remove `.travis.yml` from this repository
  - Follow updates in Gmail SMTP errors and codes on Apr 29 and May 10 at `Sisimai::Rhost::Google`
    #513 #515 #519
    - https://support.google.com/a/answer/3726730?hl=en
    - https://github.com/azumakuniyuki/feb-2024-no-auth-no-entry/commit/1d6adede
    - https://github.com/azumakuniyuki/feb-2024-no-auth-no-entry/commit/d477b178
    - Implement SMTP error codes as follows: `4.7.23`, `4.7.30`, `4.7.32`, `5.7.29`, and `5.7.30`
    - Shortened error message patterns to make them more adaptable to minor sentence changes.
  - Multibyte characters in the code and comments have been replaced with ASCII characters. #514
  - Import sisimai/rb-sisimai#280 Deal the Apple unsubscribe notification as an ARF message #516
  - Add the following error message patterns returned from Exchange Online #517
    - 4.4.317, 5.4.317: STARTTLS is required to send mail
    - 4.4.318, 5.4.318: Connection was closed abruptly (SuspiciousRemoteServerError)
  - #518 Added 16 error message patterns into the following reasons:
    - `Blocked`
    - `Expired`
    - `Filtered`
    - `MailboxFull`
    - `NoRelaying`
    - `Suspend` 
    - `UserUnknown`
  - #320 #520 use Codecov for the coverage

v5.0.2
---------------------------------------------------------------------------------------------------
- release: "Wed, 13 Mar 2024 13:00:00 +0900 (JST)"
- version: "5.0.2"
- changes:
  - #507 Migrate the CI from TravisCI to GitHub Actions
  - Fixed an issue where constant initialization would fail on Perl 5.26
  - `5.7.23` returned from Office365 is an error related to SPF vilation (authfailure)
  - #508 Fixed an issue that Sisimai could not get the value of `alias` address correctly when an
    email forwarded and bounced
  - `Sisimai::RFC5322->received` now returns a list including all the elements except date time and
    (comments) found in the `Received` header
  - Update the error message patterns in `Sisimai::Rhost::Mimecast`
  - Update the error message patterns in the followings:
    - `AuthFailure`
    - `Blocked`
    - `Expired`
    - `MailboxFull`
    - `SecurityError`
    - `SpamDetected`
    - `Suspend`

v5.0.1
---------------------------------------------------------------------------------------------------
- release: "Sun,  3 Mar 2024 17:17:17 +0900 (JST)"
- version: "5.0.1"
- changes:
  - #464 Import the commit 78465c79970474602be796232bea345909078b9a at `t/023-mail-stdin.t`
  - #501 Implement three SMTP status codes as follows: `5.7.28`, `5.7.29` and `5.7.30` described in
    https://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xhtml
  - #502 The values of `reason` of `postfix-28.eml` and `postfix-29.eml` in decoded results have
    been fixed to `notcompliantrfc`.
  - #504 Implement and update SMTP error codes, reply codes, and error messages described at Google
    https://support.google.com/a/answer/3726730?hl=en in `Sisimai::Rhost::Google`.
  - #505 Fix bugs in `t/500-fact.t` and `t/600-lhost-code.t` at the code `use YAML;`. In Sisimai,
    The YAML module is an optional and not required. Thanks to @eserte

v5.0.0
---------------------------------------------------------------------------------------------------
- release: "Fri,  2 Feb 2024 23:22:22 +0900 (JST)"
- version: "5.0.0"
- changes:
  - **INCOMPATIBLE CHANGES SINCE SISIMAI VERSION 4**
    - Sisimai version 5 requires Perl 5.26 or later
      - #446, 448 Use the postfix dereference
    - `Sisimai->make` marked as obsoleted, use `Sisimai->rise` instead
    - Sisimai does not return the result which reason is `vacation` by default. Use `vacation => 1`
      option at `Sisimai->rise()` method to get the parsed results for `vacation` reason. #436 #437
    - `Sisimai::Data` and `Sisimai::Fact`
      - #419, #420 `Sisimai::Data` class has been renamed to `Sisimai::Fact`
      - #402 `Sisimai::Data->softboucne` marked as obsoleted and will be removed at v5.1.0, use
        `Sisimai::Fact->hardbounce` instead
    - #401 `Sisimai::Message`
      - `Sisimai::Message` no longer create an object
      - `Sisimai::Message->make` has been renamed to `Sisimai::Message->rise`
    - #399 Callback feature
      - Parameter `hook` for a callback has been removed from `Sisimai->make` and `Sisimai->dump`.
        Use the first element of the `c___` parameter for setting a callback method instead.
      - Parameter `c___` is a parameter of `Sisimai->rise` and `Sisimai->dump`, is an array refer-
        ence and have two elements:
      - The first element of `c___` is the same as the `hook` parameter, is for a callback method
        email headers and entire message body
      - The second element of the `c___` parameter is for a callback method for each email file in
        Maildir/. The callback method is called at the end of each email file parsing.
      - Implement the following error reasons:
        - `AuthFailure` is a bounce reason which rejected due to SPF, DKIM, or DMARC failure #467
        - `BadReputation` is a bounce reason which rejected due to an IP address reputation #469
        - `NotCompliantRFC` is a bounce reason which rejected due to non-compliance with RFC
        - `RequirePTR` is a bounce reason which rejected due to missing PTR or having invalid PTR
        - `Speeding` is a bounce reason which rejected due to exceeding a rate limit or sending too
          fast #466
  - Implement `Sisimai::RFC2045`: Born again `Sisimai::MIME` for compatibility with the Go language
    version of Sisimai #407
  - #429 `Sisimai::Message->rise()` parses twice when the entire message body of a bounced mail is
    multi parted begins with "message/rfc822".
  - #431 Add error messages in some European languages into Office365 and Domino
  - #445 Implement `Sisimai::STMP::Transcript` for parsing a transcript of session log
  - #451 Reduce substitution code by using `for`
  - #490, #495 Reduce 82% of regular expressions
    - Implement the following methods:
      - `Sisimai::SMTP::Command->test`
      - `Sisimai::SMTP::Reply->test`
      - `Sisimai::SMTP::Status->test`
      - `Sisimai::SMTP::Status->prefer`
      - `Sisimai::String->aligned`
      - `Sisimai::String->ipv4`
  - Rename the following classes in `Sisimai::Rhost`:
    - `Sisimai::Rhost::Microsoft` (ExchangeOnline)
    - `Sisimai::Rhost::Google` (GoogleApps)
    - `Sisimai::Rhost::Tencent` (TencentQQ)
  - Add a sample email bounced from Rakuten Mobile: sisimai/set-of-emails#20
    - `lhost-postfix-76.eml` (userunknown)
  - Add sample emails bounced from Amazon SES
    - `lhost-postfix-77.eml` (norelaying)
    - `lhost-postfix-78.eml` (contenterror)
  - Happy Birthday to Suzu a.k.a. "Neko-dono" Michitsuna

v4.25.16p1
---------------------------------------------------------------------------------------------------
- release: "Thu,  1 Feb 2024 12:25:22 +0900 (JST)"
- version: "4.25.16p1"
- changes:
  - #497 Tiny code improvement on `Sisimai::Lhost::EinsUndEins` to parse bounce emails in slightly
    different formats.

v4.25.16
---------------------------------------------------------------------------------------------------
- release: "Tue, 16 May 2023 15:03:56 +0900 (JST)"
- version: "4.25.16"
- changes:
  - Fix issue #491, Remove X-Auto-Response-Suppress: header from the inspection targets of Sisimai
    ::RFC3834 as it does not indicate an auto-response email. Thanks to @whity
  - Fix issue #492, To avoid slowing down the parsing speed, reduce the size of the email by re-
    moving unnecessary parts (`text/html`, `application/*`, and `image/*`). Thanks to @gody01

v4.25.15
---------------------------------------------------------------------------------------------------
- release: "Thu, 22 Dec 2022 13:00:22 +0900 (JST)"
- version: "4.25.15"
- changes:
  - #464 Fix a bug related to a `handle->close` in t/023-mail-stdin.t Thanks to CPAN Testers:
    - https://www.cpantesters.org/cpan/report/d49e1af4-4157-11ed-af16-c84d753c3a36
    - https://www.cpantesters.org/cpan/report/a0412418-49fe-11ed-b08f-a5e1b655df6e
    - https://www.cpantesters.org/cpan/report/eb7fbeb2-546c-11ed-ac00-78c860ca80ec
    - https://www.cpantesters.org/cpan/report/4c3721d4-5763-11ed-8a1d-3dcb3994ee8b
    - https://www.cpantesters.org/cpan/report/6345c226-7848-11ed-afec-b281abd50193
    - https://www.cpantesters.org/cpan/report/c52dd804-6f1d-11ed-9b5d-686ea04ca71f
    - https://www.cpantesters.org/cpan/report/60a09c2a-6af7-11ed-affb-ea61756bb578
  - #465 Fix an error reason "5.2.1 exceedlimit" of an error message: "450-4.2.1 The user you are
    trying to contact is receiving mail at a rate that prevents additional messages from being de-
    livered" to "toomanyconn" at GoogleApps.pm in Sisimai/Rhost.
  - Add many error message patterns at the following classes in `Sisimai/Reason`
    - `Blocked`
    - `ContentError`
    - `Filtered`
    - `NetworkError`
    - `NotAccept`
    - `PolicyViolation`
    - `Rejected`
    - `SpamDetected`
    - `TooManyConn`
    - `UserUnknown`
  - When the value of `diagnosticcode` has enough error message for detecting a bounce reason,
    `expired` will change to proper reason
  - Update code in `Sisimai::Lhost::GoogleGroups` module to parse well a bounce mail even if an e-
    mail address of `X-Failed-Recipients` header does not include a domain `@googlegroups.com` #470
  - Import #471 from Sisimai v5, Implement `Sisimai::Rhost::NTTDOCOMO` to parse more strictly a
    bounce mail returned from `mfsmax.docomo.ne.jp`
  - Import #475 from Sisimai v5, Implement `Sisimai::Rhost::Mimecast`
  - Add the following error messages at `Sisimai::Rhost::ExchangeOnline:
    - 451 4.7.650 The mail server ... has been temporarily rate limited due to IP reputation (S775)
    - 550 5.7.1 ... Please contact your Internet service provider since part of their network is on
      our block list (S3150)
    - Error messages of Exchange Server 2019 #476
  - Add many error messages at `Sisimai::Rhost::GoogleApps`, Import #479
  - Import sisimai/rb-sisimai#244, Prevent ReDOS in `Sisimai::String->to_plain` method #484

v4.25.14
---------------------------------------------------------------------------------------------------
- release: "Mon, 15 Aug 2022 14:00:22 +0900 (JST)"
- version: "4.25.14"
- changes:
  - #461 Fix 2 bugs with the value of "timestamp" at the parsed result.

v4.25.13
---------------------------------------------------------------------------------------------------
- release: "Mon,  1 Aug 2022 16:06:55 +0900 (JST)"
- version: "4.25.13"
- changes:
  - #455 Fix a bug related to utf8-flag in the value of Subject: header at test: t/501-data-json.t.
    Thanks to CPAN Testers:
    - http://www.cpantesters.org/cpan/report/8d7d0a08-f7a2-11ec-b1f1-9c81f839ead0
    - http://www.cpantesters.org/cpan/report/de86d022-f898-11ec-a81a-c3b444d77217
    - http://www.cpantesters.org/cpan/report/3169fa64-0198-11ed-a82a-d5de2185f16d
    - http://www.cpantesters.org/cpan/report/ea451228-02ae-11ed-a985-cd0ba7eeaf61

v4.25.12
---------------------------------------------------------------------------------------------------
- release: ""Mon, 22 Nov 2021 12:22:22 +0900 (JST)"
- version: "4.25.12"
- changes:
  - #438 Localize global variables used by YAML and YAML::Syck:`$YAML::Syck::*`, `$YAML::*`. at
    `Sisimai::Data::YAML` module. Thanks to @bschmalhofer
  - #441 Add a new error code of La Poste at `Sisimai::Rhost::FrancePTT` module, a new sample email
    `rhost-franceptt-12.eml` into set-of-emails/ directory. Thanks to @vhenon
  - Add `rfc3464-41.eml` and `rfc3464-42.eml`
  - Remove all the HTML elements from the value of "diagnosticcode".
  - #442, #443 Fix serious bugs:
    - Both of the values of `deliverystatus` and `replycode` detected from the message body did not
      use at `Sisimai::Lhost::Exim`.
    - `true` method strictly checks the value of `smtpcommand` at some classes in `Sisimai/Reason`
      directory. For example, when a detected reason is `spamdetected` and `virusdetected` the val-
      ue of `smtpcommand` should be `DATA` or an SMTP command to be sent after `DATA`.

v4.25.11
---------------------------------------------------------------------------------------------------
- release: "Mon, 22 Feb 2021 21:11:22 +0900 (JST)"
- version: "4.25.11"
- changes:
  - Import some commits from Sisimai version 5 preview #422
    - Improved code for getting an email address in `Sisimai::Address`
    - Improved code for checking the day of month value, for converting a full month name and a
      full day of the week at `Sisimai::DateTime`
    - Improvement code for picking text blocks of message/rfc822 part in RFC5322
    - Add 60+ error message patterns
    - Improved code for encodings in `Sisimai::Lhost::Domino`, `Sisimai::String`

v4.25.10
---------------------------------------------------------------------------------------------------
- release: "Tue, 22 Dec 2020 13:22:22 +0900 (JST)"
- version: "4.25.10"
- changes:
  - #384 Remove the following old methods (marked as obsolete from v4.25.6)
    - `Sisimai::Mail->close` (automatically closes at the EOF)
    - `Sisimai::Mail->type` (use `Sisimai::Mail->kind` instead)
    - `Sisimai::Mail->mail->*` (use `Sisimai::Mail->data->*` instead)
  - #415 Code improvement for `Source-IP` field on ARF. Thanks to @cucx
  - #416 Exim and X3 in `Sisimai::Lhost` improved. Thanks to @AmarkhiS
  - #418 Updates for DMARC and SPF related errors
    - The value of `reason` rejected due to DMARC policy is `policyviolation`
    - The value of `reason` rejected due to no SPF record is `rejected`
    - Add some sample emails related to above into set-of-emails/
  - #421 Fixed a serious bug at the value of `token` in the parsed results only in the Perl version
    of sisimai since v4.22.1p1 (Released 2017 Summer). The value of `token` generated by Sisimai::
    Data->new method between v4.22.1p1 to v4.25.9 returns a meaningless value because there were
    wrong arguments for `Sisimai::String->token` method call.

v4.25.9
---------------------------------------------------------------------------------------------------
- release: "Sat,  3 Oct 2020 22:00:00 +0900 (JST)"
- version: "4.25.9"
- changes:
  - Fix typo in `Sisimai::SMTP::Error`. Thanks to @hekeli #410
  - #411 Fix a serious performance problem in regular expressions using `.+` at some error message
    patterns in Sisimai::Reason. Thanks to Martin Kluge.
  - #414 Support Null MX (RFC7505) on Sendmail sisimai/set-of-emails#4

v4.25.8
---------------------------------------------------------------------------------------------------
- release: "Fri, 17 Jul 2020 11:59:49 +0900 (JST)"
- version: "4.25.8"
- changes:
  - **Repository URL was changed to https://github.com/sisimai/p5-sisimai**
  - `Sisimai::Message->make` method was merged into `Sisimai::Message->new`
  - `Sisimai::Message->divideup` returns an array (faster than a hash) #390
  - Remove unused code blocks for deciding the order of email header fields at `Sisimai::Data->
    make()` method
  - Remove old parameters: `datasrc` and `bounces` at the callback feature #394
  - Implement `Sisimai::Rhost::Spectrum` for parsing bounce mails returned from
    https://www.spectrum.com/. Thanks to @meir-w #395
  - Remove unused method `Sisimai::Rhost->list` #396
  - Implement `Sisimai::Rhost::Cox` for parsing bounce mails returned from Cox: https://cox.com/.
    Thanks to @meir-w #398

v4.25.7
---------------------------------------------------------------------------------------------------
- release: "Wed, 25 Apr 2020 22:22:22 +0900 (JST)"
- version: "4.25.7"
- changes:
  - #391 Make required minimum Perl version clear: v5.10.1 or later
  - Fix bug around state, constant only in Perl 5.10.0. Thanks to CPAN Testers:
    - www.cpantesters.org/cpan/report/45cc37b2-848e-11ea-8c85-8657451fef07
    - www.cpantesters.org/cpan/report/7a121fac-8590-11ea-9066-e374b0ba08e8

v4.25.6
---------------------------------------------------------------------------------------------------
- release: "Wed, 22 Apr 2020 16:22:22 +0900 (JST)"
- version: "4.25.6"
- changes:
  - #367 Fix a little spelling errors. Thanks to @guimard
  - #368 Make `Sisimai::Message` 33% faster
    - Use the negative look-ahead regular expression code for converting all of the email header
      strings into key-value pairs as a HASH at newly implemented method `Sisiai::Message->makemap`
      #366. Thanks to @xtetsuji
    - Remove `Sisimai::Message->takeapart` (replaced with `makemap`)
    - Remove `Sisimai::Message->headers` (replaced with `makemap`)
    - Code improvement for `require` statement before method calls #371
  - Make `Sisimai::Order` 12% faster
    - Rewrite `Sisimai::Order->make`
    - Remove `Sisimai::Order->by`
    - Remove `Sisimai::Order->headers`
    - Remove `Sisimai::Lhost->headerlist`
    - And all `headerlist()` methods have been removed from `Sisimai::Lhost::*`, `Sisimai::RFC3834`
      and `Sisimai::ARF`
    - The MTA module to be loaded at first is decided by the first 2 words of each bounce mail sub-
      ject, is defined at `$Subject` in `Sisimai::Order`
    - Some variables are replaced with `state`
  - Each `field` parameter has been removed from the following methods because Sisimai detect all
    the email header fields by `Sisimai::Message->makemap()` without having to specify field names
    at `field` parameter
    - `Sisimai->make`
    - `Sisimai::Message->new`
    - `Sisimai::Message->make`
  - Code improvement for `require` statement before calling `match` method of some modules defined
    in `$PreMatches` at `Sisimai::Reason::UserUnknown`
  - #369 Remove the following unused methods:
    - `Sisimai::MIME->patterns`
    - `Sisimai::SMTP->command`
  - Some file global variables have been replaced with `state` #371
  - Performance improvement: 12% faster, reduced 6% of method calls
  - `Sisimai::Lhost::Google` has been renamed to `Sisimai::Lhost::Gmail` #377
  - Implement 4 MTA modules: #373 #376
    - `Sisimai::Lhost::Barracuda`
    - `Sisimai::Lhost::PowerMTA`
    - `Sisimai::Lhost::X6`
    - `Sisimai::Lhost::GoogleGroups`
  - `email-` prefix of each sample email in set-of-emails/maildir directory has been replaced with
    `lhost-` sisimai/set-of-emails#14
  - SMTP Agent improvement #362
    - Remove `Email::` prefix from the value of `smtpagent` at parsed results
    - Remove `Sisimai::Lhost->smtpagent` method
  - Improved the following MTA modules:
    - `Sisimai::Lhost::Amavis` #380
    - `Sisimai::Lhost::InterScanMSS`
    - `Sisimai::Lhost::Office365` improvement for reading MIME-encoded subject
    - `Sisimai::Lhost::Exchange2007` supports error messages in `it-CH`
  - Tiny bug fix for `Subject` header decoding
  - Fix bug in code for getting an `"addresser"` address from `From:` field in the original message
    part which are multiple lines at `Sisimai::ARF`. #385 Thanks to @jcbf
  - #383 New accessor `origin` at `Sisimai::Data` and the parsed results for keeping a path to the
    source email
  - #384 `Sisimai::Mail` improvement for compatibilities with the Go language version of Sisimai
    which will be released this summer #389
    - Removed `Sisimai::Mail::STDIN->name` (not used)
    - Removed `Sisimai::Mail::Maildir->inodes` (not needed to check the inode)
    - Warning message is displayed when the following methods are called:
      - `Sisimai::Mail->close` (automatically closes at the EOF)
      - `Sisimai::Mail->type` (use `Sisimai::Mail->kind` instead)
      - `Sisimai::Mail->mail->*` (use `Sisimai::Mail->data->*` instead)
      - Methods above will be removed at v4.25.10
    - `Sisimai::Mail::Memory->data` renamed to `Sisimai::Mail::Memory->payload`
    - `Sisimai::Mail::Maildir->size` keeps the number of files in the Maildir/
    - `Sisimai::Mail::Maildir->offset` keeps the number of email files in the Maildir/ which have
      been read
    - Call `Sisimai::Mail::*->read` directly instead of `Sisimai::Mail->read`
  - Remove `Sisimai::Lhost::UserDefined` (not used)
  - #387 Add the following D.S.N. codes and error messages (not tested)
    - Thanks to @jcbf
    - `Mailbox does not exist!` at `Sisimai::Reason::UserUnknown` (Amazon SES)
    - `Not a valid recipienet` at `Sisimai::Reason::UserUnknown` (Yahoo!)
    - `Envelope blocked` at `Sisimai::Reason::Rejected` (Minecast.com)
    - `5.2.122` is toomanyconn, `5.4.11` is contenterror, `5.7.51` is blocked at `Sisimai::Rhost::
      ExchangeOnline`

v4.25.5
---------------------------------------------------------------------------------------------------
- release: "Wed, 22 Jan 2020 14:44:44 +0900 (JST)"
- version: "4.25.5"
- changes:
  - **JSON READING AS AN INPUT SOURCE AND JSON PARSING AS A BOUNCE OBJECT ARE NO LONGER PROVIDED AS
    OF v4.25.5**
  - The following obsoleted classes and modules have been removed #356 #359
    - `Sisimai::Message::Email`
    - `Sisimai::Message::JSON`
    - `Sisimai::Order::Email`
    - `Sisimai::Order::JSON`
    - `Sisimai::Bite::Email`
    - `Sisimai::Bite::JSON`
  - #344 Add POD section into 2 obsoleted modules: `Sisimai::Bite::Email` and `Sisimai::Bite::JSON`
    Thanks to @guimard
  - #343 Fix little spelling error at `Sisimai::Order`. Thanks to @guimard
  - #342 Fix parser code to get an error message which is not beginning with `#` character at
    `Sisimai::Lhost::Exchange2007`. Thanks to @aderumier
  - #347 Support case insensitive error code at `Sisimai::Rhost::FrancePTT`. Thanks to @aderumier
  - #348 Code improvement at `Sisimai::Lhost::EinsUndEins` for detecting error messages and setting
    the value of `rhost`.
  - Code improvements at `Sisimai::Lhost::Postfix` to parse an email which have neither delivery
    reports nor error messages. Thanks to @aderumier
  - Code improvements at `Sisimai::RFC3834` to parse a vacation message replied automatically from
    iCloud. Thanks to @aderumier at #346
  - Many Pull-Requests and sample emails for French ESPs. Thanks to @aderumier
    - Add 4 error code values at `Sisimai::Rhost::FrancePTT` #349 #353 #357
      - `102` = `blocked`
      - `426` = `suspend`
      - `505` = `systemerror`
      - `999` = `blocked`
    - Add 7 sample emails at set-of-emails/ directory: rhost-franceptt-04, 05, 06, 07, 08, 10, and
      11 for `Sisimai::Rhost::FrancePTT` #353 #357
    - Add many error codes and error messages from Orange and La Poste
  - Code improvement at `Sisimai::Lhost::Postfix` for setting `HELO` to the value of `smtpcommand`
    in the parsed results. #350
  - Tiny improvement around accessors and variables
  - Large scale code improvement at each modules in `Sisimai::Lhost`
  - reduce the number of lines in code about 12%

v4.25.4
---------------------------------------------------------------------------------------------------
- release: "Tue,  3 Dec 2019 12:22:22 +0900 (JST)"
- version: "4.25.4"
- changes:
  - #332 **THE ABILITY TO READ JSON STRING AS AN INPUT SOURCE AND TO PARSE JSON FORMATTED BOUNCE
    MESSAGE WILL NOT BE SUPPORTED AT Sisimai 4.25.5**
  - **The following modules for reading json string as an input source, and for parsing json for-
    matted bounce message will be removed at Sisimai 4.25.5**
    - `Sisimai::Message::JSON`
    - `Sisimai::Bite::JSON`
    - `Sisimai::Bite::JSON::AmazonSES`
    - `Sisimai::Bite::JSON::SendGrid`
    - `Sisimai::Order::JSON`
  - Implement a new MTA module class `Sisimai::Lhost`, it is a parent class of all the MTA modules
    for a bounce mail returned as an email message via SMTP and **THE FOLLOWING NAME SPACES WERE
    MARKED AS OBSOLETED OR REMOVED** #333
    - `Sisimai::Bite`: Use `Sisimai::Lhost` instead
    - `Sisimai::Bite::Email`: Merged into `Sisimai::Lhost`
    - `Sisimai::Bite::Email::*`: Moved under `Sisimai::Lhost` as the same named MTA module
  - The following modules were marked as obsoleted, will be removed and merged into each parent
    class
    - `Sisimai::Message::Email`
    - `Sisimai::Order::Email`
  - USAGE AND PARAMETERS FOR THE FOLLOWING METHODS HAVE NOT BEEN CHANGED AT ALL AND WILL NOT BE
    CHANGED AFTER Sisimai 4.25.5
    - `Sisimai->make`
    - `Sisimai->dump`
    - `Sisimai::Message->new`
  - Implement `Sisimai::Rhost::IUA` for SMTP error codes at https://www.i.ua/.
  - Update error message pattern for ClamSMTP at "virusdetected" reason.
  - Do not use utf8 flag
  - Multibyte characters in the original subject header will not be removed and replaced with "MUL-
    TIBYTE CHARACTERS HAS BEEN REMOVED"
  - Error message `... had no relevant answers.` from GSuite is classified into `networkerror`.

v4.25.3
---------------------------------------------------------------------------------------------------
- release: "Sat,  7 Sep 2019 15:00:02 +0900 (JST)"
- version: "4.25.3"
- changes:
  - Fix code for getting a recipient address from the original message part at `Sisimai::ARF` #325
  - #326 Fix code for getting a recipient address and a subject string from the original messaage
    part at `Sisimai::Bite::Email::MailMarshalSMTP`
  - Fix code to delete unused multipart headers at `Sisimai::MIME->breaksup()`
  - Fix spell in a key name of hash for storing a recipient adress and regular expression for get-
    ting a recipient address at `Sisimai::RFC3464`
  - #328 Fix code for getting a recipient address and an expanded address from `Final-Recipient:`
    and `Original-Recipient:` field at `Sisimai::RFC3464`
  - Update code for matching error message "The user you are trying to contact is receiving mail at
    a rate that prevents additional messages from being delivered." at `Sisimai::Rhost::GoogleApps`
  - Update error message pattern for "blocked" reason from GMX: "ESMTP Service not available No
    SMTP service Bad DNS PTR resource record."
  - Update error message pattern for "suspend" reason responded from i.ua MTA: "550 Mailbox is fro-
    zen."
  - Remove the following Perl versions from .travis.yml so Travis CI no longer support old Perls:
    - 5.10
    - 5.16

v4.25.2
---------------------------------------------------------------------------------------------------
- release: "Thu,  1 Aug 2019 20:00:00 +0900 (JST)"
- version: "4.25.2"
- changes:
  - #323 Fix two serious bugs:
    - MIME decoding code in Sisimai::MIME
    - Code to capture a recipient address in Sisimai::Bite::Email::IMailServer
  - Strictly checks the number of parsed emails in `make test`

v4.25.1
---------------------------------------------------------------------------------------------------
- release: "Tue, 23 Jul 2019 10:00:00 +0900 (JST)"
- version: "4.25.1"
- changes:
  - #310 Bug fix in `Sisimai::Rhost::GoogleApps`. Thanks to @beeing.
  - Check the format of the value of `Message-Id` header for detecting a bounce mail from Exim or
    not.
  - Call `Sisimai::Rhost::FrancePTT` module when the value of `rhost` includes `.wanadoo.fr`.
  - #312 Add an error message: `This mailbox is disabled` from `yahoo.com` into `Sisimai::Reason::
    Suspend`. Thanks to @beeing.
  - #315 Fix code at `Sisimai::Message::Email->takeapart()` to decode `Subject` header of the orig-
    inal message.
  - #316 Update error messages for Low Reputation Error from Gmail.
  - Fix code for checking `rhost` value at `Sisimai::Rhost`.
  - Parser code to read bounce mails from m-FILTER at `Sisimai::Message::Email` has been improved.
    Thanks to Nomura Research Institute, Ltd.
  - Status 5.4.1 from Exchange Online is classified into "rejected" reason.
  - Callback method specified at `Sisimai::Message->new` with `hook` is called just before calling
    `scan()` method of each `Sisimai::Bite::Email` module.
  - Code improvement in `Sisimai::Bite::Email::Sendmail` for getting error messages returned from
    Google.
  - Sisimai works on Perl 5.30.

v4.25.0
---------------------------------------------------------------------------------------------------
- release: "Tue,  9 Apr 2019 10:22:22 +0900 (JST)"
- version: "4.25.0"
- changes:
  - Implement new class `Sisimai::RFC1894` for parsing message/delivery-status part. #298
  - Experimental implementation at the following MTA, Rhost modules:
    - `Sisimai::Bite::Email::Amavis`: amavisd-new
    - `Sisimai::Rhost::TencentQQ`: Tencent QQ (mail.qq.com)
  - Sisimai works with JSON 4.00
  - Remove unused methods and variables
    - `Sisimai::DateTime->hourname`
    - `$Sisimai::DateTime::HourNames`
    - `Sisimai::RFC5322->is_domainpart`
    - `Sisimai::Address->is_undisclosed`
  - Code refactoring: less lines of code and shallower indentation.
  - Fix bug in `Sisimai::ARF` to resolve issue #304. Thanks to @lewa.
  - Remove `set-of-emails/logo` directory because we cannot change the license of each file in the
    directory to The 2-Clause BSD License.
  - Update error message patterns in the following modules:
    - `Sisimai::Reason::Blocked` (hotmail, ntt docomo)
    - `Sisimai::Reason::SystemError` (hotmail)
    - `Sisimai::Reason::TooManyConn` (ntt docomo)
    - `Sisimai::Reason::UserUnknown` (hotmail)
    - `Sisimai::Reason::PolicyViolation` (postfix)
    - `Sisimai::Bite::Email::McAfee` (userunknown)
    - `Sisimai::Bite::Email::Exchange2007` (securityerror)
  - Bug fix in `$Sisimai::Message::Email::TryOnFirst`: Module name to be loaded is checked before
    calling `push` function for avoiding duplication.
  - The order of `Sisimai::Bite::Email` modules to be loaded has been changed: Load Office365 and
    Outlook prior to Exchange2007 and Exchange2003.
  - Update the followng MTA modules for improvements and bug fixes:
    - `Sisimai::Bite::Email::Exchange2007`
  - MIME Decoding in `Subject:` header improved.
  - Bug fix in `Sisimai::MIME->is_mimeencoded` method.
  - Make stable the order of MTA modules which have MTA specific email headers at `Sisimai::Order::
    Email->headers` method.

v4.24.1
---------------------------------------------------------------------------------------------------
- release: "Wed, 14 Nov 2018 11:09:44 +0900 (JST)"
- version: "4.24.1"
- changes:
  - Fix bug in `Sisimai::RFC3464` module: scan method unintentionally detects non-bounce mail as a
    bounce #296. Thanks to @whity.
  - Remove unused method `Sisimai::DateTime->o2d` to avoid test failure with Perl 5.16.2 on NetBSD
    #297. Thanks to Nigel Horne and CPAN Testers.
  - Build test with Perl 5.28 on Travis CI.

v4.24.0
---------------------------------------------------------------------------------------------------
- release: "Thu,  1 Nov 2018 18:00:00 +0900 (JST)"
- version: "4.24.0"
- changes:
  - Variable improvement (remove redundant substitution)
  - Remove `Sisimai::RFC2606` (Unused module)
  - MIME decoding improvement (Import Pull-Request from sisimai/rb-Sisimai#131)
    - Implement `Sisimai::MIME->makeflat`
    - Implement `Sisimai::MIME->breaksup`
    - Call `Sisimai::MIME->makeflat()` at `Sisimai::Message::Email->parse()`
    - Other related updates in `Sisimai::Bite::Email::*`
  - Tiny improvement in `Sisimai::String->to_plain()` method.
  - Update "blocked" error message patterns for iCloud.
    - `A client IP address has no PTR record`
    - `Invalid HELO/EHLO name`

v4.23.0
---------------------------------------------------------------------------------------------------
- release: "Fri, 31 Aug 2018 20:18:35 +0900 (JST)"
- version: "4.23.0"
- changes:
  - #195 Implement `Sisimai::Mail::Memory` class for reading bounce messages from memory(variable).
  - Update regular expression pattern in `Sisimai::Bite::Email::Office365` for detecting failure on
    SMTP RCPT.
  - Fix #288, test fails when localtime and gmtime differs. Thanks to @guimard.
  - Follow up #289 (issue #288): Some test code have been loosened for UTC+13 (Pacific/Tongatapu),
    UTC+14 (Pacific/Kiritimati).
  - #290 Less function calls: redundant `length` and `require` function calls have been removed.
  - #291 Fix typo in POD of `Sisimai::Data`. Thanks to @racke.

v4.22.7
---------------------------------------------------------------------------------------------------
- release: "Mon, 16 Jul 2018 13:02:54 +0900 (JST)"
- version: "4.22.7"
- changes:
  - Register D.S.N. `4.4.312` and `5.4.312` on Office 365 as "networkerror".
  - Fix error message pattern in `Sisimai::Reason::SecurityError`.
  - Fix code to get the original `Message-Id` field which continued to the next line.
    Thanks to Andreas Mock.
  - Update error message pattern in `Sisimai::Reason::SpamDetected`.
  - Add 15 sample emails for Postfix, Outlook and others.
  - Add 3 sample emails for `Sisimai::RFC3464`.
  - Add 2 sample vacation emails for `Sisimai::RFC3834`.

v4.22.6
---------------------------------------------------------------------------------------------------
- release: "Wed, 23 May 2018 20:00:00 +0900 (JST)"
- version: "4.22.6"
- changes:
  - #271 Most `Module::Load::load` have been replaced with `require`.
  - #272 Fix bug in `Sisimai::MIME->qprintd()`.
  - #273 Error message pattern defined in `Sisimai::Reason::Filtered` has been replaced with fixed
    strings.
  - #274 Fix many spelling errors in some Pods. Thanks to @guimard.
  - #275 Remove sample email files listed in sisimai/set-of-emails#6 to clarify copyrights for
    `libsisimai-perl` package on Debian. Thanks to @guimard.
  - The value of `softbounce` in the parsed results is always `1` when a reason is `undefined` or
    `onhold`.
  - #278 Less regular expression in each class of `Sisimai::Bite::Email`.
  - #279 Cool logo for "set-of-emails". Thanks to @batarian71.
  - #281 Implement `Sisimai::Rhost::KDDI` for detecting a bounce reason of au via `msmx.au.com` or
    `lsean.ezweb.ne.jp`. Thanks to @kokubumotohiro.
  - #282 Update sample emails and codes for getting error messages in a bounced email on Yahoo!.
  - Add many sample emails for "notaccept" and "rejected".

v4.22.5
---------------------------------------------------------------------------------------------------
- release: "Fri, 30 Mar 2018 12:29:16 +0900 (JST)"
- version: "4.22.5"
- changes:
  - #260 The order for loading MTA modules improvement.
  - #261 "make test" now passes on Windows. Thanks to @charsbar.
  - Sample emails in set-of-emails/ which are not owned by Sisimai project have been removed.
  - Update error message patterns in `Sisimai::Reason::Expired`.
  - Many error message patterns in Sisimai::Reason have been converted to fixed strings #266 #268.
  - #267, #269: Use `rindex()` function instead of `index()` function.
  - #232, #270, Pre-Updates for au.com, the new domain of EZweb announced at their site
    http://news.kddi.com/kddi/corporate/newsrelease/2017/08/22/2637.html

v4.22.4
---------------------------------------------------------------------------------------------------
- release: "Wed, 14 Feb 2018 10:44:00 +0900 (JST)"
- version: "4.22.4"
- changes:
  - Issue #253, Add status code 4.7.25(RFC-7372) as "blocked".
  - Pull-Request #254, Remove unused method: `Sisimai::Bite::Email->pattern()` and the same methods
    defined in each child class.
  - Obsoleted method `Sisimai::Address->parse()` has been removed.
  - The following performance improvements makes 1.34 times faster.
    - Less regular expression #255. Thanks to @xtetsuji.
    - The following Pull-Requests have been imported from rb-Sisimai.
      - sisimai/rb-Sisimai#105
      - sisimai/rb-Sisimai#107
      - sisimai/rb-Sisimai#108
    - Replace `$v =~ /\A...\z/` with `$v eq '...'`
    - Replace `$v =~ /\A.../` with `index($v, '...') == 0`
    - Replace `$v =~ /.../` with `index($v, '...') > -1`
    - Replace `$v =~ /.\z/` with `substr($v, -1, 1) eq '.'`
    - #258 Remove `/i` modifier from each regular expression as possible and call `lc()` function
      before calling `Sisimai::Reason::*->match` method.
    - Import Pull-Request sisimai/rb-Sisimai#111, Loop improvement.
  - #251 Declaration of the version has been changed: use version;

v4.22.3
---------------------------------------------------------------------------------------------------
- release: "Tue, 26 Dec 2017 09:22:22 +0900 (JST)"
- version: "4.22.3"
- changes:
  - Merge Pull-Request #238, Fix some typos in POD. Thanks to @brewt.
  - Add `set-of-emails/json/json-amazonses-06.json` as a sample JSON object from sisimai/rb-Sisimai
    #88.
  - Merge #239, Add bounce message patterns in MailboxFull.pm and Blocked.pm for laposte.net and
    orange.fr. Thanks to @Quickeneen.
  - Fix code to avoid warning message "Use of uninitialized value in length" at the following mod-
    ules on only Perl 5.10.1:
    - `Sisimai::Bite::Email::GSuite`
    - `Sisimai::Message::Email`
    - `Sisimai::Address`
  - Merge Pull-Request #244 at issue #243 for following up pull-request #239, more support for Or-
    ange and La Poste. Thanks to @Quickeneen.
  - Merge Pull-Request #245: update error message patterns of SFR and Free.fr.
  - Merge Pull-Request #246: error message patterns have been improved on Exim.
  - Fix bug in regular expression at `Sisimai::Reason::HostUnknown`.
  - Merge Pull-Request #247, Add 100+ error message patterns into the following reason classes:
    Blocked, Expired, Filtered, HostUnknown, PolicyViolation, MailboxFull, NetworkError, Rejected,
    NoRelaying, SpamDetected, SystemError, Suspend, TooManyConn, and UserUnknown.
  - Merge Pull-Request #248, code improvement at `Sisimai::Data->make` method to remove string like
    `550-5.1.1` from the beginning of each line in an error message for to be matched exactly with
    regular expression patterns in `Sisimai::Reason::*`.
  - Merge Pull-Request #248, `Sisimai::Rhost::ExchangeOnline` improved.
  - Implement new MTA module: `Sisimai::Bite::Email::FML` to parse bounce mails generated by fml
    mailing list server/manager.

v4.22.2
---------------------------------------------------------------------------------------------------
- release: "Fri, 13 Oct 2017 11:33:00 +0900 (JST)
- version: "4.22.2"
- changes:
  - Code improvements in `Sisimai::Reason::UserUnknown`, some MTA modules in `Sisimai/Bite/Email`
  - Support parsing JSON object retrieved from SendGrid Event Webhooks #211.
  - Support "event": "spamreport" via Feedback Loop on SendGrid Event Webhooks.
  - Implement `Sisimai::Address->is_undisclosed` method.
  - Implement `Sisimai::Rhost::GoDaddy` to get a correct reason at parsing bounce mails from Go-
    Daddy (reported at issue #236). Thanks to @ViktorNacht.
  - Remove obsoleted classes and methods:
    - `Sisimai::MTA`
    - `Sisimai::MSP`
    - `Sisimai::CED`
    - `Sisimai::Address->parse`

v4.22.1
---------------------------------------------------------------------------------------------------
- release: "Tue, 29 Aug 2017 17:25:22 +0900 (JST)"
- version: "4.22.1"
- changes:
  - `Sisimai::Address` was born again to resolve issue #227
    - Implement new email address parser method: `find()`
    - Implement new constructor: `make()`
    - Implement new writable accessors: `lname()` and `comment()`
    - `parse()` method was marked as obsoleted
  - Build test with Perl 5.26 on Travis-CI.

v4.22.0
---------------------------------------------------------------------------------------------------
- release: "Tue, 22 Aug 2017 18:25:55 +0900 (JST)"
- version: "4.22.0"
- changes:
  - #215 and Pull-Request #225, bounce reason: "securityerror" has been divided into the following
    three reasons:
    - **securityerror**
    - **virusdetected**
    - **policyviolation**
  - Sisimai now works on Perl 5.26.0
  - issue #226 All the MTA modules have been moved to `Sisimai::Bite::*` and old MTA/MSP modules: 
    `Sisimai::MTA`, `Sisimai::MSP`, `Sisimai::CED`, and all of the methods in these classes have
    been marked as obsoleted.
  - Issue #227 Experimental implementation: `Sisimai::Address->find()` as born again parser method
    for email addresses. Thanks to @SteveTheTechie.

v4.21.1
---------------------------------------------------------------------------------------------------
- release: "Mon, 29 May 2017 14:22:22 +0900 (JST)"
- version: "4.21.1"
- changes:
  - Improved error message patterns to resolve issue #221, Thanks to @racke.
  - Add `mta-exim-30.eml` as a sample email in set-of-emails/ directory.
  - Changes file has been renamed to **ChangeLog.md** and converted to Markdown format.
  - Pull-Request #223, Improved code to detect error messages related to DNS at G Suite.
  - Improved code to detect RFC7505 (NullMX) error: sisimai/set-of-emails#4.
  - Code improvements for checking and decoding irregular MIME encoded strings at `is_mimeencoded`
    and `mimedecode` methods in `Sisimai::MIME` class reported from @winebarrel.
  - Add unit test codes to test all the changes at sisimai/rb-Sisimai#75.

v4.21.0 - Support G Suite
---------------------------------------------------------------------------------------------------
- release: "Mon, 10 Apr 2017 12:17:22 +0900 (JST)"
- version: "4.21.0"
- changes:
  - Experimental implementation: new MTA module `Sisimai::MSP::US::GSuite` for parsing a bounce
    mail returned from G Suite. Thanks to @racke at issue #218.
  - Improved `Sisimai::SMTP::Status->find()` method. The method checks whether a found value as
    D.S.N. is IPv4 address or not.
  - Improved code for getting error messages, D.S.N. values, and SMTP reply codes in `Sisimai::MTA
    ::Postfix->scan()` method.
  - #212 `Sisimai->make()` and `Sisimai::Message->new()` methods check the value of a `field` argu-
    ment more strictly.
  - Fix some typos in method comments: Import pull-request #69 at Ruby version of Sisimai,
    https://github.com/sisimai/rb-Sisimai/pull/69. Thanks to @koic.
  - Issue #217: Fix some macros in Makefile to get cpanm. Thanks to @sgroef.

v4.20.2
---------------------------------------------------------------------------------------------------
- release: "Sat, 11 Mar 2017 16:32:48 +0900 (JST)"
- version: "4.20.2"
- changes:
  - #207 Add some error message patterns for a bounce message from Amazon SES SMTP endpoint.
  - Register sample email "rfc3834-06.eml" based on an email that is uploaded from @rdeavila at
    https://github.com/sisimai/rb-Sisimai/issues/65 to test a vacation message.
  - Improvements of code for the callback feature: Add a new argument `field` in `Sisimai->make()`
    to pass email header names being captured and referred at `Sisimai::Message::Email` class.

v4.20.1
---------------------------------------------------------------------------------------------------
- release: "Sat, 31 Dec 2016 22:02:22 +0900 (JST)"
- version: "4.20.1"
- changes:
  - Nothing changed. Follow the fixed version of rb-Sisimai(JRuby).

v4.20.0 - Support Bounce Ojbect (JSON)
---------------------------------------------------------------------------------------------------
- release: "Sat, 31 Dec 2016 13:36:22 +0900 (JST)"
- version: "4.20.0"
- changes:
  - #199 Experimental implementation: New MTA modules for 2 Cloud Email Deliveries. These modules
    can parse JSON formatted bounce objects and can convert to Sisimai::Data object.
    - `Sisimai::CED::US::AmazonSES`
    - `Sisimai::CED::US::SendGrid`
  - Format of the value of `smtpagent` in the parsed result has been changed. It includes the cate-
    gory name of MTA/MSP modules like `MTA::Sendmail`, `MTA::Postfix`, and `MSP::US::SendGrid` #200
  - #202 The domain part of a dummy email address defined in `Sisimai::Address` has been changed:
    `dummy-domain.invalid` => **`libsisimai.org.invalid`**;
  - `Sisimai::SMTP->is_softbounce()` method has been deleted.

v4.19.0 - Callback Feature
---------------------------------------------------------------------------------------------------
- release: "Tue, 18 Oct 2016 14:13:22 +0900 (JST)"
- version: "4.19.0"
- changes:
  - Remove utf8 flag from JSON string returned from at `Sisimai->dump` method.
  - Implement a callback feature at `Sisimai->make()` and `Sisimai->dump()` methods. More imforma-
    tion about the feature are available at the following pages:
    - https://libsisimai.org/en/usage#callback
    - https://libsisimai.org/ja/usage#callback
  - Implement `Sisimai->match()` method: issue #173.
  - Minor bug fix in `Sisimai::MSP::US::AmazonSES->scan()` method.

v4.18.1
---------------------------------------------------------------------------------------------------
- release: "Sun, 11 Sep 2016 20:05:20 +0900 (JST)"
- version: "4.18.1"
- changes:
  - Fix bug in `Sisimai::MIME->qprintd()` method reported at issue #192.
  - Import sisimai/rb-Sisimai@fb45a47, MIME decoding improvements.
  - Issue #194, fix bug in `Sisimai::Mail->new` called from `Sisimai->dump`. It didn't work proper-
    ly when email data read from STDIN.
  - `Sisimai->dump` and `Sisimai->make` methods die when the number of arguments is neither 1 nor 3
  - Implement `Sisimai::String->to_plain()` for converting from HTML message to plain text before
    parsing, issue #8.
  - Remove `Sisimai::String->to_regexp()` method, use `qr/\Q...\E/` instead.

v4.18.0 - Improvements for Microsoft Exchange Servers
---------------------------------------------------------------------------------------------------
- release: "Mon, 22 Aug 2016 20:40:55 +0900 (JST)"
- version: "4.18.0"
- changes:
  - Issue #189, Soft bounce improvement. Thanks to @Quickeneen.
  - Pull-Request #190, `Sisimai::SMTP->is_softbounce()` method has been marked as obsoleted. Use
    `Sisimai::SMTP::Error->soft_or_hard()` method instead.
  - Issue #185, Sisimai works on Perl 5.24.
  - `Sisimai::MTA::Exchange` has been renamed to `Sisimai::MTA::Exchange2003`.
  - Implement new MTA module `Sisimai::MTA::Exchange2007`.

v4.17.2
---------------------------------------------------------------------------------------------------
- release: "Tue, 26 Jul 2016 21:00:17 +0900 (JST)"
- version: "4.17.2"
- changes:
  - Issue #174, Implement `Sisimai::Rhost::ExchangeOnline` module to parse a bounce mail from on-
    premises Exchange 2013 and Office 365.
  - The reason of status code: `4.4.5` is `systemfull`.
  - Issue #181, Fixed minor bug on OpenBSD.
  - Pull-Request #185: Code improvement at `Sisimai::MSP::US::Office365`.
  - Pull-Request #188: Code improvement at `Sisimai::MIME`. Thanks to @jonjensen.

v4.17.1
---------------------------------------------------------------------------------------------------
- release: "Wed, 30 Mar 2016 14:00:22 +0900 (JST)"
- version: "4.17.1"
- changes:
  - Fixed issue #179 by pull-request #180, a variable in Sisimai/MTA/Exim.pm is not quoted before
    passing to `qr//` operator. Thanks to @dzolnierz.

v4.17.0 - New Error Reason "syntaxerror"
---------------------------------------------------------------------------------------------------
- release: "Wed, 16 Mar 2016 12:22:44 +0900 (JST)"
- version: "4.17.0"
- changes:
  - Implement new reason **syntaxerror**. Sisimai will set **syntaxerror** to the raeson when the
    value of `replycode` begins with "50" such as 502, 503, or 504. issue #147.
  - Implement `description()` method at each file in `Sisimai/Reason` directory at issue #166.
  - Implement `Sisimai->reason()` method for getting the list of reasons Sisimai can detect and its
    description: issue #168.
  - Remove unused method `Sisimai::Reason->match()`, issue #169.
  - Remove unused methods in `Sisimai::MSP` and `Sisimai::MTA`, issue #136.
  - Remove unused module `Sisimai::ISO3166`, issue #137.
  - Remove unused module `Sisimai::RFC5321` and `Sisimai::RFC3463`, issue #131.
  - Some class methods of `Sisimai::Address` allow the folowing local part as an email address:
    - `postmaster`
    - `mailer-daemon`
  - `Sisimai::RFC5322->is_mailerdaemon` method returns `1` when the argument includes `postmaster`.
  - Merge pull-request #172, new method `Sisimai::RFC5322->weedout()` and code improvements in all
    the MTA/MSP modules.

v4.16.0 - New Error Reason "delivered"
---------------------------------------------------------------------------------------------------
- release: "Thu, 18 Feb 2016 13:49:01 +0900 (JST)"
- version: "4.16.0"
- changes:
  - Implement new reason "**delivered**". Sisimai set `delivered` to the reason when the value of
    `Status:` field in a bounce message begins with `2`. This feature is optional and isn't enabled
    by default. issue #155.
  - Implement new method `Sisimai->engine`. The method returns the list of MTA and MSP module list
    implemented in Sisimai.

v4.15.0
---------------------------------------------------------------------------------------------------
- release: "Sat, 13 Feb 2016 12:40:15 +0900 (JST)"
- version: "4.15.0"
- changes:
  - Implement new MSP module `Sisimai::MSP::US::AmazonWorkMail` at pull-request #162. The module
    parse bounce mails via Amazon WorkMail.
  - Implement new MSP module `Sisimai::MSP::US::Office365` at pull-request #164. The module parse
    bounce mails via Microsoft Office 365.
  - Tiny code improvements: back port from the Ruby version of Sisimai.

v4.14.2
---------------------------------------------------------------------------------------------------
- release: "Wed,  3 Feb 2016 12:26:19 +0900 (JST)"
- version: "4.14.2"
- changes:
  - Issue #154 Fix bug: remove CR(`\r`) at the end of string in some properties of `Sisimai::Data`
    before calling the constructor. Thanks to M Miyamoto.
  - Issue #151 fix bug that the value of folded `Message-Id:` field could not be found at pull-re-
    quest #157. Thanks to @0xcdcdcdcd.
  - Fix bug in `Sisimai::MSP::RU::Yandex`: getting a pseudo delivery status.
  - Implement `Sisimai::String->to_regexp()` method to fix bug in code to build regular expression
    reported at pull-request #160, Thanks to @negachov.
  - Improved message pattern of `Sisimai::Reason::SpamDetected`.
  - Issue #158, bug fix for substituting the value of `lhost` and `rhost`.

v4.14.1 - Sample Emails Moved To "set-of-emails" Repository
---------------------------------------------------------------------------------------------------
- release: "Sat, 26 Dec 2015 20:00:00 +0900 (JST)"
- version: "4.14.1"
- changes:
  - eg/ directory has been renamed and sample email files have been moved to the project repository
    https://github.com/sisimai/set-of-emails, issue #153.

v4.14.0
---------------------------------------------------------------------------------------------------
- release: "Fri, 25 Dec 2015 11:04:14 +0900 (JST)"
- version: "4.14.0"
- changes:
  - **Repository URL was changed to https://github.com/sisimai/p5-Sisimai**
  - `Sisimai::MTA->SMTPCOMMAND()` method has been obsoleted from this version. Use `Sisimai::SMTP->
    command()` instead, issue #136.
  - `Sisimai::MTA->LONGFIELDS()` and `Sisimai::MTA->RFC822HEADERS()` are obsoleted. Use `Sisimai::
    RFC5322->LONGFIELDS()` and `Sisimai::RFC5322->HEADERFIELDS()` instead.
  - Change internal method names of `Sisimai::Message`
      - `rewrite()` begins `parse()`
      - `resolve()` begins `make()`
  - #110, #122 Code for reading email files in a directory is improved and got faster than before:
    merged Pull-Request #123.
  - Fixed bug reported at issue #124: warning message: `use of uninitialized value in substr at` is
    displayed when `Sisimai::Message->resolve()` method parses an UNIX mbox which begins from blank
    line.
  - Merged Pull-Request #125, filehandle will not be closed until EOF of each UNIX mbox in `Sisimai
    ::Mail::Mbox->read()` method.
  - Merged Pull-Request #126, replace `while( <$f> )` with `do {...}` block for reading each email
    file in a directory at `Sisimai::Mail::Maildir->read()` method.
  - Merged Pull-Request #132, Resolve issue #127: Sisimai cannot parse a mail which message body is
    MIME encoded. Thanks to @mrwushu.
  - Issue #134, `Sisimai::RFC3463` and `Sisimai::RFC5321` have been obsoleted but are not removed.
    Use `Sisimai::SMTP::Status`, `Sisimai::SMTP::Reply` instead.
  - Merged Pull-Request #138, some code blocks in `Sisimai::Message->resolve()` have been divided
    into some methods.
  - Fixed bug at issue #142, Sisimai can not parse an email that TAB or Space character exists at
    the end of each line. Thanks to M Miyamoto.
  - Fixed bug at issue #144, support date format like `Thursday, Apr 29, ...`.
  - Improved code of `Sisimai::MTA::IMailServer` for support more error message patterns #143.
  - Issue #145 Code improvements: back port from Ruby version of Sisimai.
  - Fix bugs in regular expression to detect SMTP command in `Sisimai::MTA::X4` and `Sisimai::MTA::
    qmail` modules.

v4.13.1 - Two White Cats
---------------------------------------------------------------------------------------------------
- release: "Tue, 17 Nov 2015 14:13:10 +0900 (JST)"
- version: "4.13.1"
- changes:
  - #95, Add some sample emails for `Sisimai::MTA::Exim`.
  - Improved code `Sisimai::MTA::Exim` to get the reason and the SMTP command from LMTP error mes-
    sage.
  - Improved error message patterns at the following modules:
      - `Sisimai::Reason::UserUnknown`
      - `Sisimai::Reason::Rejected`
      - `Sisimai::Reason::Blocked`
  - #96, Improved `Sisimai::MTA::Exim` for parsing "Frozen message".
  - #101, Improved code for getting DSN value in `Sisimai::MTA::Exim`.
  - #107, Improved slow regular expression in `Sisimai::MSP::JP::EZweb`.
  - #114 (MTA Order Optimization) issue #116 (Performance tunings), and #118 (Regular expression
    across the MTA modules) are merged. These improvements that were taught from two white cats in
    my dream on Nov. 7, and have made Sisimai 1.15 times faster. Thanks to sensible white cats.

v4.13.0 - To Be Semantic Versioning
---------------------------------------------------------------------------------------------------
- release: "Thu,  5 Nov 2015 16:11:12 +0900 (JST)"
- version: "4.13.0"
- changes:
  - **#85, Use Semantic Versioning from this release. New version number is v4.13.0 <= v4.1.30.**
  - #84, Experimental implementation: New module `Sisimai::MTA::X5` and added a sample email x5-01.
    eml for the module. Thanks to Masayoshi.M .
  - Issue #86, Removed unused `version()` method from the following modules: `Sisimai::RFC3464`,
    `Sisimai::RFC3834`, `Sisimai::ARF`, `Sisimai::MTA::*`, and `Sisimai::MSP::*::*`.
  - Issue #88, #89: fixed `Sisimai::MTA::Notes` and added notes-04.eml.
  - Issue #90, #91: fixed code around `Sisimai::Data->alias()`.
  - Improved codes of `Sisimai::MTA::*`, `Sisimai::MSP::*`, `Sisimai::RFC3464` and `Sisimai::ARF` 
    as a precaution against serious bug reported on #89.
  - Improved codes and serious bug fix for #89 have made Sisimai 1.10 times faster than before.
  - #92, All the methods have YARD format comment.
  - #93, #94: Fixed bug and improved code for getting alias address and setting the error reason in
    `Sisimai::MTA::Exim` module.

v4.1.29
---------------------------------------------------------------------------------------------------
- release: "Tue,  6 Oct 2015 10:55:00 +0900 (JST)"
- version: "4.1.29"
- changes:
  - Issue #83, New MTA module implemented as `Sisimai::MSP::US::ReceivingSES`. This module parse
    bounce mails from Amazon SES(Receiving).
  - Improved code for getting and setting the value of `Status:` field.
  - Improved document in `Sisimai::Data` and `Sisimai::Reason`, imported from the sisimai web site.
  - Added new sample email rfc3834-03.eml to test code for `Sisimai::RFC3834`.
  - Added new sample emails: sendmail-26,27,28,29,30,31,32.eml.

v4.1.28 - HAPPY 1ST BIRTHDAY
---------------------------------------------------------------------------------------------------
- release: "Sun, 16 Aug 2015 14:50:20 +0900 (JST)"
- version: "4.1.28"
- changes:
  - **Happy 1st Birthday To Sisimai !!**
  - Experimental implementation about issue #76: New module `Sisimai::RF3834` is for detecting auto
    replied message and decides a reason as `vacation`.
  - Fixed bug in `Sisimai::Message` for setting the order of MTA, MSP modules.
  - Issue #70, Implemented code for using user defined MTA module and added `Sisimai::MTA::UserDe-
    fined` as a sample.
  - Issue #78, Implement new accessor `->softbounce` in `Sisimai::Data` object.

v4.1.27 - Sisimai->dump() Method
---------------------------------------------------------------------------------------------------
- release: "Fri, 17 Jul 2015 11:45:05 +0900 (JST)"
- version: "4.1.27"
- changes:
  - New method implemented: `Sisimai->dump('/path/to/mbox')` return parsed data as JSON string.
  - Updated error message patterns in the following classes:
    - `Sisimai::Reason::NoRelaying`
    - `Sisimai::Reason::TooManyConn`
    - `Sisimai::Reason::Blocked`
  - Fixed code in `Sisimai::Reason::MesgTooBig`. Error reason of bounce message that the value of
    `Status` field is 5.2.3 will be set as `exceedlimit`.
  - Fixed code to get the value of Message-Id header in the original message at `Sisimai::Data`
    class.
  - Sisimai reports the bounce reason as `onhold` when `Sisimail::Reason->get` method did not de-
    cide the reason and the value of `diagnosticcode` is not empty.
  - Issue #74 is that reported at CPAN Testers Report might be fixed.
  - Issue #75, Improved code for parsing 2-digit year value in a `Date:` field at Sisimai::DateTime
    class.
  - The following test codes for MTA modules: `Sisimai::MTA`, `Sisimai::MSP`, `Sisimai::ARF`, and
    `Sisimai::RFC3464` have been integrated and improved.

v4.1.26 - New Error Reason "toomanyconn"`
---------------------------------------------------------------------------------------------------
- release: "Sat,  4 Jul 2015 11:34:44 +0900 (JST)"
- version: "4.1.26"
- changes:
  - Module name changed from `Sisimai::Reason::RelayingDenied` to "NoRelaying".
  - Registered new error reason "TooManyConn". This reason is bounced due to that too many connec-
    tions or exceeded connection rate limit.
  - Included many error messages listed in SendGrid "Deliverability Center": "https://sendgrid.com/
    deliverabilitycenter/" as a regular expression at Sisimai::Reason::*. Thanks to Bogdan B. and
    SendGrid.
  - Experimental implementation: `Sisimai::Reason->match()` is for detecting a bounce reason from
    given text as an error message.
  - Experimental impelmentation about issue #61:New MTA module implemented as `Sisimai::MTA::Apache
    James`. The module is for parsing bounce emails which are generated by Apache James/Java Apache
    Mail Enterprise Server. Thanks to John Aldrich Quan.
  - Issue #72, Support SMTP reply code in `Sisimai::Data` object.
  - Fixed code: Add "SystemFull" reason into `Sisimai::Reason->anotherone()`.
  - Improved regular expression in `Sisimai::MSP::US::Google`.

v4.1.25 - Reason Name "nospam" Changed To "spamdetected"
---------------------------------------------------------------------------------------------------
- release: "Mon, 22 Jun 2015 11:45:29 +0900 (JST)"
- version: "4.1.25"
- changes:
  - **Reason name has been changed from "NoSpam" to "SpamDetected".**
  - Package name has been changed from `Sisimai::Time` to `Sisimai::DateTime`.
  - Implemnet `Sisimai::Time` again as a child class of `Time::Piece`.
  - The class of "timestamp" is now `Sisimai::Time` in `Sisimai::Data` object.
  - Implement `Sisimai::Reason::HasMoved`.
  - 2 emails bounced due to "expired" reason have been added as a sample for issue #50.
  - Fix bug in `Sisimai::MTA::MailMarshalSMTP` for a bounce mail which have no boundary strings.
  - Fix bug in `Sisimai::MTA::Exim` for setting an error reason decided by SMTP MAIL command.
  - Improved regular expression in `Sisimai::RFC3464`.
  - Update `Sisimai::MDA`, add an error message pattern defined in dovecot 1.2, dovecot/src/plugins
    /quota/quota.c.
  - Update message patterns at SpamDetected, SystemError, Filtered, RelayingDenied, NetworkError,
    MesgTooBig, MailboxFull, SecurityError, UserUnknown, Blocked and Suspend.
  - Fix code for detecting MIME encoded string in `Sisimai::MIME`.
  - Implement `TO_JSON` method in `Sisimai::Address` for JSON module.
  - Add test code for sample emails in CRLF.
  - Add sample emails which is an IDN email.
  - Add sample emails which could not be parsed yet into eg/cannot-parse-yet/ directory and imple-
    ment test code.
  - Add sample emails which reason is `undefined` into eg/reason-is-undefined directory and imple-
    ment test code.

v4.1.24
---------------------------------------------------------------------------------------------------
- release: "Mon, 11 Jun 2015 22:20:59 +0900 (JST)"
- version: "4.1.24"
- changes:
  - Improved fallback code in `Sisimai::RFC3464`.
  - Add message patterns at NoSpam and HostUnknown in Sisimai/Reason.

v4.1.23
---------------------------------------------------------------------------------------------------
- release: "Thu, 11 Jun 2015 13:20:59 +0900 (JST)"
- version: "4.1.23"
- changes:
  - Sisimai works on Perl 5.22.0.
  - New MTA module `Sisimai::MTA::X4` for qmail clone MTAs.
  - Performance tuning, Sisimai is now 1.39 times faster than before.
  - Improved code in Sisimai/Message.pm: 1.62 times faster than before.
  - Bug fix in `Sisimai::MSP::JP::EZweb` and `Sisimai::MSP::JP::KDDI`.
  - Support "2015-04-29 01:23:45" date format in `Sisimai::Time`.
  - Support the value of `Diagnostic-Code` without the value of `diagnostic-type` field in `Sisimai
    ::RFC3464`.
  - Emails in https://github.com/sendgrid/go-gmime/tree/master/gmime/fixtures and some emails have
    been added as a sample in `eg/` directory.
  - Add message patterns at NoSpam, MailboxFull, RelayingDenied, UserUnknown, Blocked, Filtered,
    SecurityError, Expired, HostUnknown, and NetworkError in `Sisimai/Reason` directory.
  - Fix bug in `Sisimai::Data` for calling `Sisimai::Time->parse()` method.
  - `Sisimai::MTA::IMailServer` and `Sisimai::MTA::InterScanMSS` updated.
  - Implement fallback code in `Sisimai::RFC3464`: parse entire message body to get a recipient ad-
    dress and error messages. The value of `smtpagent` parsed by this code is `RFC3464::Fallback`.

v4.1.22
---------------------------------------------------------------------------------------------------
- release: "Thu, 28 May 2015 14:20:59 +0900 (JST)"
- version: "4.1.22"
- changes:
  - Merged pull request #59: Support for Microsoft custom ARF format. Thanks to @jleroy.
  - Issue #60: Add `Time::Piece` and `Module::Load` to ./cpanfile. Thanks to @kkdYodoKazahaya
  - Update `Sisimai::ARF` for parsing Amazon SES Complaints bounces.

v4.1.21
---------------------------------------------------------------------------------------------------
- release: "Tue, 21 Apr 2015 14:20:59 +0900 (JST)"
- version: "4.1.21"
- changes:
  - Update regular expressions of each error message pattern at `Sisimai/Reason` direcotry: NoSpam,
    Suspend, Blocked, UserUnknown, Expired, NetworkError, MailboxFull and MesgTooBig.
  - Fix bug for setting the value of SMTP command at `Sisimai::Data`.
  - Update regular expression of "expired" in `Sisimai::MTA::Exim`.
  - Add three sample emails for `make test` in eg/ directory.

v4.1.20
---------------------------------------------------------------------------------------------------
- release: "Thu,  9 Apr 2015 14:20:59 +0900 (JST)"
- version: "4.1.20"
- changes:
  - Update regular expressions of each error message pattern at `SystemError.pm`, `MesgTooBig.pm`
    and `NoSpam.pm` in `Sisimai/Reason`.
  - Add two sample emails for `make test` in eg/ directory.

v4.1.19 - New Error Reason "nospam"
---------------------------------------------------------------------------------------------------
- release: "Mon,  6 Apr 2015 14:20:59 +0900 (JST)"
- version: "4.1.19"
- changes:
  - Update regular expressions of each error message pattern at `Rejected.pm`, `Mailboxfull.pm`,
    `MesgTooBig.pm`, and `UserUnknown.pm` in `Sisimai/Reason`.
  - **New error reason "nospam" implemented.**
  - Some message patterns have moved from `Sisimai::Reason::SecurityError` to `Sisimai::Reason::
    NoSpam` module.

v4.1.18 - New Repository Name "p5-Sisimai"
---------------------------------------------------------------------------------------------------
- release: "Fri, 27 Mar 2015 12:59:07 +0900 (JST)"
- version: "4.1.18"
- changes:
  - **Repository name on github has been changed to p5-Sisimai.**
  - Fixed code around regular expressions of "mailboxfull" and "expired" in MTA modules: `Sisimai::
    MTA::qmail` and `Sisimai::MTA::Exim`. Thanks to @m-walk at issue #57.
  - Update regular expressions of error message pattern at `SecurityError.pm` and `Blocked.pm` in
    `Sisimai/Reason`.

v4.1.17
---------------------------------------------------------------------------------------------------
- release: "Mon,  2 Mar 2015 16:01:20 +0900 (JST)"
- version: "4.1.17"
- changes:
  - Improved regular expressions of networkerror, expired and related code in `Sisimai::MTA::qmail`
    Thanks to @m-walk at issue #56.

v4.1.16
---------------------------------------------------------------------------------------------------
- release: "Wed, 18 Feb 2015 16:01:20 +0900 (JST)"
- version: "4.1.16"
- changes:
  - Add bounce emails as a sample from Postfix 3.0.0.
  - Improved code for reading mail data from STDIN at `Sisimai::Mail`.
  - Try to load `YAML::Syck` module instead of YAML module when string `"yaml"` is specified in the
    argument of `Sisimai::Data->dump()` method.

v4.1.15
---------------------------------------------------------------------------------------------------
- release: "Wed, 11 Feb 2015 13:59:59 +0900 (JST)"`
- version: "4.1.15"
- changes:
  - Improved code for detecting abuse message "opt-out" in `Sisimai::ARF`.
  - Minor improvements in `Sisimai::MTA::Postfix`.

v4.1.14 - Accessors Of Sisimai::Mail Changed
---------------------------------------------------------------------------------------------------
- release: "Fri,  6 Feb 2015 13:29:59 +0900 (JST)"
- version: "4.1.14"
- changes:
  - Update `Sisimai::MSP::US::Outlook` for delayed message.
  - Implement new module: `Sisimai::Mail::STDIN` for reading email data from standard-in.
  - **Changed accessor names in `Sisimai::Mail::Mbox`, `Sisimai::Mail::Maildir` modules: `name` to
    `file`, `files` to `inodes`.**
  - **Accessor `path` always return the path to a mailbox or path to each mail file in Maildir/ at
    `Sisimai::Mail::Mbox` and `Sisimai::Mail::Maildir`.**
  - Implement new accessor `dir`, it returns the path to directory of given argument in `Sisimai::
    Mail::Mbox` and `Sisimai::Mail::Maildir`.

v4.1.13 - Sisimai::Reason->index
---------------------------------------------------------------------------------------------------
- release: "Tue, 27 Jan 2015 15:00:55 +0900 (JST)"
- version: "4.1.13"
- changes:
  - Fixed bug in test code for `Sisimai::DATA::YAML`. Thanks to CPAN Testers Reports.
  - Implement new method `Sisimai::Reason->index()`, returns the list of bounce reasons.

v4.1.12 - New Error Reason "networkerror"
---------------------------------------------------------------------------------------------------
- release: "Sat, 24 Jan 2015 15:00:59 +0900 (JST)"
- version: "4.1.12"
- changes:
  - Update sample code in POD at `Sisimai::RFC5322` and test codes (RT#101436, Issue #41, See
    https://rt.cpan.org/Ticket/Display.html?id=101436). Thanks to Mark Stosberg.
  - **Changed accessor name: `data` to `path` in `Sisimai::Mail`.**
  - Space character will be inserted after ":" in `Sisimai::Data::JSON`.
  - Improved regular expression for getting the value of email header at each MTA module.
  - Message patterns related to DNS or network error have been moved to new module: `Sisimai::
    Reason::NetworkError`.
  - **New error reason "networkerror": the value of reason for bounce messages returned due to net-
    work related errors will be set as the reason.**
  - **Sisimai does not rely on `Try::Tiny` module from this version.**

v4.1.11 - Performance Improvements
---------------------------------------------------------------------------------------------------
- release: "Thu, 15 Jan 2015 15:01:59 +0900 (JST)"
- version: "4.1.11"
- changes:
  - Improved code in Sisimai/Mail/Mbox.pm: using `substr` function instead of a regular expression
    is 1.46 times faster than before.
  - Code improvement in Sisimai/Reason.pm: using `grep {}` block instead of a regular expression is
    133% faster than before.
  - Revert commit 0c7782cecafdc923d3c82b81a201a787611654ea for `Sisimai::Time`.
  - Improvement of pattern match in Sisimai/Message.pm is 2.27 times faster.
  - Improvement of regular expressions in each MTA module is 115% faster than before.

v4.1.10 - +2 MTA Modules
---------------------------------------------------------------------------------------------------
- release: "Mon, 12 Jan 2015 17:59:35 +0900 (JST)"
- version: "4.1.10"
- changes:
  - Implement the following MTA/MSP modules:
    - `Sisimai::MSP::UK::MessageLabs` (Symantec.cloud: formerly MessageLabs)
    - `Sisimai::MSP::US::Bigfoot` (bigfoot.com)
  - Added 2 sample emails: arf05.eml, arf-06.eml and improved `Sisimai::ARF` from pull request #37,
    Thanks to @jcbf.
  - Merged pull request #38, Updated `Sisimai::US::Facebook` and DMARC forensic related codes, and
    error message patterns in Sisimai::Reason::* modules. Thanks to @jcbf.
  - Merged pull request #39, Updated `Sisimai::RFC3464` and message patterns in `Sisimai::Reason::
    SecurityError` and Suspended. Thanks to @jcbf.
  - Regular expression improvements in each MTA module(issue #40) is between 122% and 800% faster
    than Sisimai 4.1.9.

v4.1.9  - +3 MTA Modules
---------------------------------------------------------------------------------------------------
- release: "Wed, 31 Dec 2014 18:59:22 +0900 (JST)"
- version: "4.1.9"
- changes:
  - Implement the following MTA/MSP modules:
    - `Sisimai::MTA::X3` (Unknown MTA(3))
    - `Sisimai::MSP::DE::EinsUndEins` (1&1)
    - `Sisimai::MTA::MailMarshalSMTP` (Trustwave Secure Email Gateway: formerly MailMarshal SMTP)
  - Improved code for getting error message in a bounce mail from MXLogic.
  - Added 4 sample emails from pull request #32, Thanks to @jcbf.
  - Added 4 sample emails and updated error message patterns at some files in Sisimai/Reason direc-
    tory from pull request #34, Thanks to @jcbf.
  - Improved code for getting FBL related values in `Sisimai::ARF`.

v4.1.8  - YAML is Also Supported
---------------------------------------------------------------------------------------------------
- release: "Fri, 19 Dec 2014 17:22:59 +0900 (JST)"
- version: "4.1.8"
- changes:
  - Support new data format: YAML(optional, "YAML" module required).

v4.1.7
---------------------------------------------------------------------------------------------------
- release: "Thu, 18 Dec 2014 23:59:59 +0900 (JST)"
- version: "4.1.7"
- changes:
  - Tiny code improvement of `Sismai::MSP::RU::Yandex`.
  - Improved code for detecting email bounce from MXLogic.
  - Add some message patterns into `Sisimai::Reason::Expired`.
  - Implement the following MTA/MSP modules:
    - `Sisimai::MSP::US::Zoho` (Zoho Mail)
    - `Sisimai::MTA::X2` (Unknown MTA(2))
  - Improved code for getting error message in a bounce mail from Zoho Mail.

v4.1.6
---------------------------------------------------------------------------------------------------
- release: "Sun,  7 Dec 2014 22:44:36 +0900 (JST)"
- version: "4.1.6"
- changes:
  - Improved code for parsing email bounce from @nokiamail.com.
  - Implement `Sisimai::MSP::RU::Yandex` for email bounces from Yandex.Mail.

v4.1.5
---------------------------------------------------------------------------------------------------
- release: "Fri,  5 Dec 2014 18:20:22 +0900 (JST)"
- version: "4.1.5"
- changes:
  - Fix newline of some sample emalis in eg/ directory.

v4.1.4
---------------------------------------------------------------------------------------------------
- release: "Thu,  4 Dec 2014 20:40:22 +0900 (JST)"
- version: "4.1.4"
- changes:
  - Improved code for checking bounce mail in `Sisimai::MTA::OpenSMTPD`.
  - Implement the following modules for Email Service Providers:
    - `Sisimai::MSP::RU::MailRu` (@mail.ru)
    - `Sisimai::MSP::DE::GMX` (GMX)

v4.1.3  - Add 5 MTA/MSP Modules
---------------------------------------------------------------------------------------------------
- release: "Sun, 23 Nov 2014 21:22:55 +0900 (JST)"
- version: "4.1.3"
- changes:
  - Improved code for detecting error reason in `Sisimai::Reason` module.
  - Implement the following MTA/MSP modules:
    - `Sisimai::MTA::MessagingServer` (Oracle Communications Messaging Server, Sun Java System Mes-
       saging Server)
    - `Sisimai::MTA::X1` (Unknown MTA(1))
    - `Sisimai::MSP::US::Yahoo` (Yahoo! MAIL)
    - `Sisimai::MSP::US::Aol` (Aol Mail)
    - `Sisimai::MSP::US::Outlook` (Outlook.com)

v4.1.2  - Key Name Changed To "timestamp"
---------------------------------------------------------------------------------------------------
- release: "Sat, 22 Nov 2014 22:22:22 +0900 (JST)"
- version: "4.1.2"
- changes:
  - Require `Time::Local` 1.19 or later for fixing issue #21, #23, and #24.
  - **Key name of time stamp has been changed from `date` to `timestamp`**.
  - Data sources and hash algorithm of token string in parsed data have been changed.
  - Implement the following MTA modules:
    - `Sisimai::MTA::InterScanMSS` (Trend Micro InterScan Messaging Security Suite)
    - `Sisimai::MTA::SurfControl` (WebSense SurfControl)
    - `Sisimai::MTA::V5sendmail` (Sendmail v5 and other MTAs based on V5 Sendmail)
  - Fixed bounce reason names in `Sisimai::RFC3463`.

v4.1.1  - Support 6+ Commercial MTAs
---------------------------------------------------------------------------------------------------
- release: "Mon, 10 Nov 2014 15:59:03 +0900 (JST)"
- version: "4.1.1"
- changes:
  - Fix tiny bug in `Sisimai::MTA::Exim`.
  - Add many sample emails into eg/ directory.
  - Improved code for detecting connection errors at Sendmail and Courier.
  - `Sisimai::RFC3464` and `Sisimai::MTA::Exchange` imporved.
  - Implement the following MTA/MSP modules for commercial MTAs:
    - `Sisimai::MTA::Notes` (Lotus Notes)
    - `Sisimai::MTA::McAfee`
    - `Sisimai::MTA::MXLogic` (McAfee Product)
    - `Sisimai::MTA::MailFoundry`
    - `Sisimai::MTA::IMailServer` (IPSWITCHI IMail Server)
    - `Sisimai::MTA::mFILTER` (DigitalArts m-FILTER)
    - `Sisimai::MTA::Activehunter` (TransWARE Active!hunter)
  - Improved code for deciding error reason at Sendmail and qmail.

v4.1.0  - Sisimai::Group Removed Permanently
---------------------------------------------------------------------------------------------------
- release: "Sat,  4 Oct 2014 15:09:09 +0900 (JST)"
- version: "4.1.0"
- changes:
  - Sisimai::Group::* child classes and `provider`, `category` as a property in the parsed data
    have been removed permanently.
  - Fix the newline in sample email files for `make test`.

v4.0.2  - Support Amazon SES and SendGrid
---------------------------------------------------------------------------------------------------
- release: "Wed, 10 Sep 2014 22:45:43 +0900 (JST)"
- version: "4.0.2"
- changes:
  - Implement the following MTA/MSP modules:
    - `Sisimai::MSP::US::AmazonSES`
    - `Sisimai::MSP::US::SendGrid`
    - `Sisimai::MTA::Domino` (IBM Domino)
  - Large scale code refactoring at Sisimai::RFC3464.

v4.0.1
---------------------------------------------------------------------------------------------------
- release: "Sun, 17 Aug 2014 23:00:00 +0900 (JST)"
- version: "4.0.1"
- changes:
  - Fixed bug for reading each email file in the Maildir given as an argument of `Sisimai::Mail::
    Maildir->read()` method.
  - Refactoring around codes to return the parsed data.
  - Implement `make()` method to get bounce data at Sisimai.pm.

v4.0.0 - the first release
---------------------------------------------------------------------------------------------------
- release: "Sat, 16 Aug 2014 20:00:00 +0900 (JST)"
- version: "4.0.0"
- changes:
  - The first release of Sisimai.

