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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.

Fancy biff program under X11 environment. Hbiff is a replacement for xbiff that flashes when new mail arrives like the traditional xbiff. In addition, if you click on the hbiff icon, a window will popup showing the mail headers. This makes hbiff better than xlbiff where privacy is an issue since the headers are only displayed when you request. hbiff can also run the MUA for you.

Mutt -- "The Mongrel of Mail User Agents" (part Elm, part Pine, part mh, part slrn, part everything else) is an interactive screen-oriented mailer program that supersedes Elm, Pine, mail and mailx. Features include color support, message threading, MIME support (including RFC1522 support for encoded headers), customizable key bindings, POP3, Delivery Status Notification (DSN) support, and PGP/MIME. Mutt FAQ: http://dev.mutt.org/trac/wiki/MuttFaq

TurboMail is a TurboGears extension, meaning that it starts up and shuts down alongside any TurboGears applications you write, in the same way that visit tracking and identity do. TurboMail uses built-in Python modules for SMTP communication and MIME e-mail creation, but greatly simplifies these tasks by performing the grunt-work for you. Additionally, TurboMail is multi-threaded, allowing for single or batch enqueueing and background delivery of mail.

This plugin will check and display users' mail quota status. Current and maximum quota usage is displayed in easy-to-read graphical format. Optional warnings may also be displayed to users who are nearing their quota allocation when they log in (where the "Message Of The Day" would normally be displayed). This plugin is compatible with three types of mail quota systems: UNIX (filesystem), IMAP-based, and cPanel quotas.

Basically, XBuffy (and Xmultibiff) is a XBiff-type program with a lot of new options. With XBuffy you can watch multiple mailboxes. When new mail arrives, you can have a pop up window showing the From: and Subject: lines. You can also set it up to launch your favorite mail reader when you click on a box. Currently. xbuffy is only capable of watching mailboxes with the standard mailbox format (messages separated with a From line). This is version 3.2.1.

MailScanner is a complete e-mail security system designed for use on e-mail gateways. It protects against viruses, and detects attacks against e-mail client packages (such as Outlook, Outlook Express, Eudora). It can also detect almost all unsolicited commercial e-mail (spam) passing through it and respond to all incidents in a wide variety of ways. Not only can it scan for known viruses, but it can also protect against unknown viruses hidden inside e-mail attachments by refusing entry to attachments whose filenames match any given pattern. This can include generic patterns that trap filenames attempting to hide the true filename extension (e.g. ".txt.vbs"). It is superior to many commercial packages in its ability to handle attacks against itself, such as Denial Of Service attacks caused by messages containing the "Zip of Death". It is easy to install into an existing e-mail gateway, requiring very little knowledge of sendmail and no change to an existing sendmail configuration. MailScanner itself is entirely open source, but it uses widely known commercial virus scanning packages at its core. The other software it uses is all high quality open source software, leading to a system that can be trusted for performance and reliability.

Anti-Spam SMTP Proxy is a spam filter that sits on port 25 in front of your regular SMTP server (sendmail, postfix, qmail, etc). ASSP performs a number of configurable spam checks, and on detecting a spam message, provides an immediate 5xx SMTP error code back to the client. Non-spam messages are passed to your regular SMTP server for further processing and delivery. ASSP includes SSL and IPv6 support. It is a single script with a web-based configuration tool. ASSP offers: - a whitelist of known good senders - Bayesian checks on message headers and contents - recipient address validation using LDAP and RFC822 conformance - relay denial - HELO checking - SPF (Sender Policy Framework) checking - DNSBL (DNS Block List) checking using many DNSBL services - various SMTP error modes detection - Virus detection and many other spam detection techniques.

This is a simple sendmail milter which adds an X-RBL-Warning header to any emails that are received that come from an open relay as determined by your choice of RBL checking service (i.e. bl.spamcop.net). This is useful if you'd rather have the mail user agent (MUA) deal with potential spam rather than just blocking it in case you loose legitimate messages. Note that the X-RBL-Warning header is only set if the site was found to be an open-relay.

A POP3 and IMAP4 mail retriever with reliable Maildir and command delivery. Summary of features: - Retrieve mail from an unlimited number of POP3/IMAP4 mailboxes and servers. - Support for POP3-over-SSL and IMAP-over-SSL, as well as SDPS WARNING: even with SSL, "no certificate or key validation is done." so that getmail does not detect or protect from man-in-the-middle attacks. - Support for multidrop or domain mailboxes. - Safe and reliable delivery to qmail-style Maildirs, as well as program (pipe) delivery for use with arbitrary external MDAs. Includes an MDA for mbox files that supports mboxrd format and fcntl-type flock locking. - Does not destroy information by rewriting mail headers. - Does not cause mail loops by doing SMTP injection, and therefore does not require that you run an MTA (like qmail or sendmail) on your host. - Can remember which mail it has already retrieved, and can be set to only download new messages. - Written in Python, and therefore easy to extend or customize. - Simple to install, configure, and use.