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MIMEDefang is a program for inspecting and modifying e-mail messages as they pass through your mail relay. MIMEDefang is written in Perl, and its filter actions are expressed in Perl, so it's highly flexible. Here are some things that you can do very easily with MIMEDefang: Delete or alter attachments based on file name, contents, results of a virus scan, attachment size, etc. Replace large attachments with links to a centrally-stored copy to ease the burden on POP3 users with slow modem links. Add boilerplate text to e-mail messages. Customize filter rules based on domain, user-name, relay machine, etc. Reject unacceptable messages, where you define what "unacceptable" means. Add or delete recipients for a message.

Paraphrasing the website: Mailman is a mailing list manager (MLM); that is, software to help manage email discussion lists, much like Majordomo, LISTSERV, and the like. Unlike most similar products, Mailman gives each mailing list a web page and allows users to subscribe, unsubscribe, and change their preferences via the web. Even a list manager can administer his or her list(s) entirely via the web. Mailman integrates many common MLM features, including web-based archiving (though it also has hooks for external archivers), mail-to-news gateways, bounce handling, spam prevention, Majordomo-style email-based list administration, direct SMTP delivery (with fast bulk mailing), digest delivery, virtual domain support, and more. Mailman is written mostly in Python (with a smattering of C where necessary for security purposes), and includes hooks to make it easily scriptable and extensible. It is compatible with most web servers and browsers, and most mail transfer agents (mail servers). Mailman's documentation may be found on its website.

A patch to stock qmail-1.03 to get all user account information from an LDAP database. It primary target are POP toaster with huge numbers of users (from thousands up to millions). Some of it's greatest features: * Users and virtual domains in an LDAP database * No local accounts needed * Perfect for ISP's to build POP toasters * Native mail server clustering * Supports size quotas on user maildirs * Automatic creation of home- and maildir's * Handles replies with new qmail-reply * Extensive logging in qmail-smtpd and qmail-pop3d * Supports tarpitting (based on a patch by Chris Johnson) * Supports OpenLDAP 2.x, Novell NDS * Includes extensive Antispam-Features * Supports automatic maildir creation when the first mail arrives * Support for SHA, SSHA, MD5, SMD5, MD4 and RIPE-MD160 * Support for NS-MTA-MD5 encrypted passwords used by Netscape Mailserver * It also supports the password format used by Software.com's Post.Office * Support TLS (SSL) encrytion of SMTP mail transport (by Frederik Vermeulen)

This collection of modules provides perl5 access methods related to MIME. It includes the following modules: MIME::Body MIME::Decoder MIME::Decoder::Base64 MIME::Decoder::BinHex MIME::Decoder::Binary MIME::Decoder::Gzip64 MIME::Decoder::NBit MIME::Decoder::QuotedPrint MIME::Decoder::UU MIME::Entity MIME::Field::ConTraEnc MIME::Field::ContDisp MIME::Field::ContType MIME::Field::ParamVal MIME::Head MIME::IO MIME::Latin1 MIME::Parser MIME::ParserBase MIME::ToolUtils MIME::Tools MIME::Words Warning: This module is _very_ slow for (at least some) large mails, is derived from Mail-Tools, and has at least some mail-specific parts.

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.

This program is for any user who retrieves ftp files via ftpmail or bitftp servers. It runs quietly in the background and watches the user's mail directory. When the mail- retrieved file has arrived in full, rftp puts the pieces together in order and stores the tarball in a directory. I wrote this several years ago when my only link to the Arpanet was a uucp link. These days, most FreeBSD users have a direct link to the net. For the dozens or hundreds who don't this should be of use.

This package supplies batch SMTP support for sendmail, both incoming and outgoing. Batch SMTP can be used to batch and compress mail messages for UUCP links, which is faster and doesn't suffer from the address limitations of rmail. Bsmtp's version of batch SMTP is fully compatible with smail.

DavMail POP/IMAP/SMTP/Caldav/Carddav/LDAP Exchange Gateway DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client (e.g. Thunderbird with Lightning or Apple iCal) with an Exchange server, even from the internet or behind a firewall through Outlook Web Access.

DSPAM (as in De-Spam) is an open-source project to create a new kind of anti-spam mechanism, and is currently effective as both a server-side agent for UNIX email servers and a developer's library for mail clients, other anti-spam tools, and similar projects requiring drop-in spam filtering.

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.