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Active Spam Killer (ASK) protects your email account against spam by confirming the sender's email address before actual delivery takes place. The confirmation happens by means of a "confirmation message" that is automatically sent to all "unknown" users.

This package is an implementation of BATV (Bounce Address Tag Validation), a draft proposal for detecting and messages making fraudulent use of a sender address. The filter is written as a plugin to Sendmail or other filters using the milter API.

The dovecot antispam plugin watches a defined spam folder (defaults to "SPAM"). Instead of moving mail into special folders or forwarding them to special mail addresses for retraining, the plugin offers two actions for the user: 1. moving mail out of the SPAM folder and 2. moving mail into the SPAM folder. The dovecot plugin watches these actions (and additionally prohibits APPENDs to the SPAM folder, more for technical reasons than others) and tells the spam classifier that it made an error and needs to re-clas- sify the message (as spam/not spam depending on which way it was moved.)

GBuffy will poll multiple mailboxes for new mail. It will list the number of new messages in each mailbox you configure. It will also highlight the mailboxes which have new mail. Pressing the left mouse button on a mailbox with new mail will display the Sender and Subject of each new message. Additionally, GBuffy will display the X-Face header for messages which have them. Pressing the middle mouse button on a mailbox will launch the configured command, generally a command to read the mailbox with your favorite mailreader. Pressing the right mouse button will bring up the configure menu. GBuffy is currently capable of watching MBOX, MMDF, Maildir and MH Folders. This version also supports IMAP4rev1 and NNTP with XOVER. Support for an external program for notification is planned.

GKrellM mailwatch plugin A plugin for gkrellm, that watches in multiple mailboxes for new mail.

The POP3 extension makes it possible for a PHP script to connect to and interact with a POP3 mail server. It is based on the PHP streams interface and requires no external library.

Greylite is a SPAM filter with exceptional effectiveness and without false positives. It combines natively with qmail and works as a proxy for any SMTP server. It implements a modified greylisting algorithm that improves the filtering effectiveness and minimizes the delay drawbacks associated with the standard greylisting algorithm. It can be tuned to recognize suspicious clients and reject their attempts multiple times, reaching filtering rates of over 99% without false positives. Greylite is easy to setup and maintain, and it is small and fast.

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.