Feature summary for procmail:
	+ It's small
	+ Very easy to install (rated PG6 :-)
	+ Simple to maintain and configure because
	  all you need is actually only ONE executable (procmail)
	  and ONE configuration file (.procmailrc)
	+ Is event driven (i.e. gets invoked automagically when mail arrives)
	+ Does not use *any* temporary files
	+ Uses standard egrep regular expressions
	+ Allows for very-easy-to-use yes-no decisions on where the mail
	  should go
	+ Filters, delivers and forwards mail *reliably*
	+ Provides a reliable hook (you might even say anchor :-) for any
	  programs or shell scripts you may wish to start upon mail arrival
	+ Performs heroically under even the worst conditions
	  (file system full, out of swap space, process table full,
	  file table full, missing support files, unavailable executables,
	  denied permissions) and tries to deliver the mail somehow anyway
	+ Absolutely undeliverable mail (after trying every trick in the book)
	  will bounce back to the sender (or not, your choice)
	+ Is one of the few mailers to perform reliable mailbox locking across
	  NFS as well (DON'T use NFS mounted mailboxes WITHOUT installing
	  procmail, you may use valuable mail one day)
	+ Supports four mailfolder standards: single file folders (standard
	  and nonstandard VNIX format), directory folders that contain one file
	  per message, or the similar MH directory folders (numbered files)
	+ Variable assignment and substitution is an extremely complete subset
	  of the standard /bin/sh syntax
	+ Provides a mail log file, which logs all mail arrival, shows
	  in summary whence it came from, what it was about, where it went
	  (what folder) and how long (in bytes) it was
	+ Uses this log file to display a wide range of diagnostic and error
	  messages (if something went wrong)
	+ Processed mail can contain arbitrary 8-bit characters (including
	  '\0'); i.e. binary mailings can be processed if the rest of the
	  mailing system knew how to handle them too
	+ It has a man page (boy, does *it* have a man page)
	+ procmail can be used as a local delivery agent (a completely
	  integrated substitute for /bin/mail)
	+ It runs on virtually all (old and future) operating systems which
	  names start with a 'U' or end in an 'X' :-) (i.e. extremely portable
	  code; POSIX,ANSI C and K&R conforming)
	+ Works with (among others?) sendmail, smail and MMDF

Feature summary for formail:
	+ Can generate auto-reply headers
	+ Can force mail into mailbox format (so that you can process it with
	  standard mail programs)
	+ Can split up mailboxes into the individual messages
	+ Can split up digests into the individual messages
	+ Can split up saved articles into the individual articles
	+ Can do simple header munging/extraction

Feature summary for lockfile:
	+ Provides NFS-secure lockfiles to shell script programmers
