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Perdition is a mail retrieval proxy that allows users to connect to a content-free POP3 or IMAP4 server that will redirect them to their real POP3 or IMAP4 server. This enables mail retrieval for a domain to be split across multiple backend servers on a per user basis. It can also be used as a POP3 or IMAP4 proxy in firewall applications. Perdition supports arbitrary library based map access to determine the server for each user - POSIX regex, GDBM, PostgreSQL, MySQL, NIS and OpenLDAP libraries ship with the distribution. The use of perditon to scale mail services beyond a single box is discussed in a paper the author wrote on high capacity email, so be sure to check the web page.

Heirloom mailx (formerly known as "nail") is derived from Berkeley Mail and provides the functionality of the System V and POSIX mailx commands. Additional features include support for MIME, IMAP (including caching and disconnected use), POP3, SMTP, S/MIME, international character sets, maildir folders, message threading, powerful search methods, scoring, and a Bayesian junk mail filter. Mailx can be used as a mail batch language in nearly the same way as it is used interactively. It can thus act as a mailbox filter, can fetch mail from remote accounts, and can send files as attachments.

Mailparse is an extension for parsing and working with email messages. It can deal with rfc822 and rfc2045 (MIME) compliant messages. Mailparse is stream based, which means that it does not keep in-memory copies of the files it processes - so it is very resource efficient when dealing with large messages.

Mailmgr is a Sendmail Analisys Report Generator. The html reports contain the following informations: Username messages sent messages received bytes sent bytes received Messages from with date, time and bytes per user Messages to with date, time and bytes per user

mbox2mdir is a small program to convert mail stored in UNIX mbox format to qmail's Maildir format. It can (optionally) also truncate the source mbox file upon successful conversion. I use it to move mail delivered by /bin/mail or sendmail to qmail Maildir folders, but of course there are many other possible uses for it.

mls will read mailbox file in MBOX format and display various statistical data about it. You can specify input and ouput files (can be stdin/stdout), language used for output (in this version Slovak/English/Italian/Francais/Deutsch/Spanish/Serbian), error and diagnostic msgs are always printed in english. You can also specify text which will be displayed instead of standart title in output (can be used for automatic mailing of produced output). It also supports cache file for faster re-generation of stats from the same input file. It is useful when you want to show statistics on web - you can use HTML output & PHP wrapper.

Convert .MSG files to multipart MIME messages (mbox).

NullPop is a POP3 server that allows logins, but never returns any email. This is useful for certain setups where the user needs an 'account' setup in their mail client, but no real mail will ever be received.

Sendmail::Milter provides users with the ability to write mail filters in Perl that tightly integrate with sendmail's mail filter API. With this module, you can define and register Perl callbacks with the Milter engine. This module calls your perl callbacks using interpreters from a threaded persistent interpreter pool. Milter contexts are presented using an object-oriented style interface for performing operations on a Milter context.

ProxSMTP is a flexible tool that allows you to reject, change or log email based on arbitrary criteria. It accepts SMTP connections and forwards the SMTP commands and responses to another SMTP server. You need to be able to write the filtering scripts that integrate it with your particular needs.