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Postfix attempts to be fast, easy to administer, and secure, while at the same time being sendmail compatible enough to not upset existing users. Thus, the outside has a sendmail-ish flavor, but the inside is completely different. Some feautures: Connection cache for SMTP, DSN status notifications, IP version 6, Plug-in support for multiple SASL implementations (Cyrus, Dovecot), TLS encryption and authentication, Configurable status notification message text, Access control per client/sender/recipient/etc, Content filter (built-in, external before queue, external after queue), Berkeley DB database, LDAP database, MySQL database, PostgreSQL database, Maildir and mailbox format, Virtual domains, VERP envelope return addresses and others.

Ecartis is a open-source (GNU Licence) software package that adminsters mailing lists (similar to Majordomo and Listserv). Some of Ecartis's features include: - A modular design structure, so that you can compile what you need (and don't) - The ability to strip down MIME messages and remove their attachments. - Ability to be run in a multi-Virtual Host configuration. Take a look at the Ecartis website to get a full feature list:

Elm is an interactive screen-oriented mailer program that supersedes mail and mailx. This is the 2.5.x distribution.

esmtp is a user configurable relay-only Mail Transfer Agent (MTA) with a sendmail compatible syntax. It's based on libESMTP supporting the AUTH (including the CRAM-MD5 and NTLM SASL mechanisms) and the StartTLS SMTP extensions. These are the esmtp features: * fully sendmail command line compatible, * supports the AUTH SMTP extension, with the CRAM-MD5 and * NTLM SASL mechanisms, * support the StartTLS SMTP extension, * requires no administration privileges, * individual user configuration, * does not receive mail, expand aliases or manage a queue.

Asmail is a "mail-checker" like xbiff, but with the Afterstep look & feel. It indicates the status of your mailbox. It can be put in the Wharf, execute a program on incoming mail, execute a program upon mouseclick, show animations and more...

Exilog is a tool to centralize and visualize Exim logs across multiple Exim servers with a web front end. It is used in addition to Exim's standard or syslog logging. It does not require changing Exim or its logging style.

Documentation for the Exim mail transport agent in multiple formats. The Exim MTA may be installed from any of the ports named mail/exim*

The Exim monitor (eximon) is a graphical user interface for the Exim mail transfer agent for Unix systems. Eximon is distributed as part of the standard Exim distribution, but its dependency on XFree86 annoys many administrators. For this reason, it is available as its own package to allow administrators to easily install Exim without installing XFree86.

OpenDKIM is an open source implementation of the DKIM (Domain Keys Identified Mail) sender authentication system proposed by the E-mail Signing Technology Group (ESTG), now standardized by the IETF (RFC4871). It also includes an implementations of the Vouch By Reference (VBR, RFC5518) proposed standard. The OpenDKIM package consists of a library that implements the DKIM service and a milter-based filter application that can plug in to any milter-aware MTA to provide that service to sufficiently recent sendmail MTAs and other MTAs that support the milter protocol.

gnubiff is a mail notification program that checks for mail, displays headers when new mail has arrived and allow to read first lines of new mails. It relies on the GNOME and GTK libraries but can be compiled and used with or without GNOME support. Supported protocols are pop3, apop, imap4, mh, qmail and mailfile. Furthermore, gnubiff is fully configurable with a lot of options like polltime, poptime, sounds, mail reader, mailbox names, etc. and can also filter spam.