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While deploying RoundCube at the University of Michigan was developed a new skin. It is a modern, open interface with tools and actions arranged with optimal usability in mind. Light color blocks and borders delineate application areas without drawing too much attention or drawing focus away from the content.

RoundCube Webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client, including MIME support, address book, folder manipulation and message filters. RoundCube Webmail is written in PHP and requires the MySQL database. The user interface is fully skinnable using XHTML and CSS 2.

Bogofilter is a trainable email spam detector. Bogofilter takes an email message or other text on standard input, parses it into words, does a statistical check against databases of "good" and "bad" words, and returns a status code indicating whether or not the message is spam. Bogofilter decodes base64 or quoted-printable encoded texts and ignores non-text attachments and HTML comments. The supported database backends are Berkeley DB, QDBM and SQLite3.

Surblhost is a small program to see if hostnames are listed in the Spam URI Realtime Blocklists (SURBL). Hosts that are blacklisted means that global spam email have been reported to contain links to these hosts. Many popular spam email filters use these lists to identify spam email, but this program makes it possible to use the lists for any conceivable purpose, such as filtering out bad hosts from URL redirection, and so on.

Sentinel is a sendmail milter API implementation. This package might be usefull for Unix system administrators who is using freeware Sendmail. May be it's one more milter, but on the other side it's flexible enough to satisfy more or less subtle requirements for mail filtering.

Strip attachments from email, and optionally save the attachments to files. It will work with either mbox or maildir files. It is great for archiving old email without wasting space on attachments and the extra HTML message parts that some MUAs attach.

dracMail is a webmail interface built using PHP, ExtJS (JavaScript framework), MySQL and IMAP. Features include: Rich UI, WYSIWYG editor, HTML mail composing and message caching.

SmtpRC is a fully configurable, multithreaded open mail relay scanner. It supports scanning of IP blocks, and can print the results to a Web page. It is intended for Systems Administrators to check IP blocks under their control

iXhash is a plugin for the popular spam filter SpamAssassin. It computes MD5 checksums of fragments of the body of an e-mail and compares them to those of know spam. As such it works similar to the now standard plugins that use the Pyzor, Razor and DCC software packages from within SpamAssassin.

Spamd is a fake sendmail(8)-like daemon which rejects false mail. It is designed to be very efficient so that it does not slow down the receiving machine. spamd considers sending hosts to be of three types: blacklisted hosts are redirected to spamd and tarpitted i.e. they are communicated with very slowly to consume the sender's resources. Mail is rejected with either a 450 or 550 error message. A blacklisted host will not be allowed to talk to a real mail server. whitelisted hosts do not talk to spamd. Their connections are instead sent to a real mail server, such as sendmail(8). greylisted hosts are redirected to spamd, but spamd has not yet decided if they are likely spammers. They are given a temporary failure message by spamd when they try to deliver mail.