FILTER-REGEX(8)

NAME
filter-regex - smtpd filter for regular expression filtering

SYNOPSIS
filter-regex [-l limit] [file]

DESCRIPTION
filter-regex is a filter for smtpd(8) which can be used to filter mails using regular expressions matching SMTP session parameters.

The options are as follows:

-l limit
    Set the number of lines limit of filter-regex after which the regular expression processing is stopped and the mail is accepted. The accepted values are within the range of 1 and UINT_MAX.

    The default limit value is 0 (unlimited).

Depending if one of the regular expressions matches mails are either accepted or rejected with a SMTP 554 reply. Non-matching mails are always accepted.

FILES
/etc/mail/filter-regex.conf
    Default filter-regex configuration file.

SEE ALSO
filter-regex.conf(5), filter_api(3), smtpd.conf(5), smtpd(8), re_format(7), regex(3)

HISTORY
The first version of filter-regex was written in 2015.

AUTHORS
filter-regex was intially written by Armin Wolfermann <armin@wolfermann.org> and further improved by Joerg Jung <jung@openbsd.org>.