1 Qmail: MTA Mail Trasfer Agent
Why? Security, Reliability, Speed,Low memory use, User-controlled mailing lists,Virtual hosts made easy, Straightforward administration,Flexible program deliveries, Variable Envelope Return Paths,The maildir format.
2 Postfix: MTA Mail Trasfer Agent
Why? Fast, easy to administer, and secure.
3 Spamassassin: Spam Filter
Why? SpamAssassin is a mature, widely-deployed open source project that serves as a mail filter to identify Spam. SpamAssassin uses a variety of mechanisms including header and text analysis, Bayesian filtering, DNS blocklists, and collaborative filtering databases. SpamAssassin runs on a server, and filters spam before it reaches your mailbox.
4 ClamAV: Anti Virus
Why? Command-line scanner, fast, multi-threaded daemon,milter interface for sendmail,database updater with support for digital signatures, virus scanner C library, on-access scanning (Linux® and FreeBSD), detection of over 60.000 viruses, worms and trojans, built-in support for RAR (2.0), Zip, Gzip, Bzip2, Tar, MS OLE2, MS Cabinet files, MS CHM (Compressed HTML), MS SZDD, built-in support for mbox, Maildir and raw mail files, built-in support for Portable Executable files compressed with UPX, FSG, and Petite
5) Thunderbird: MUA Mail User Agent
Why? Simple to use, powerful, and customizable,supports IMAP and POP mail protocols,HTML mail formatting,Junk Mail Filters,Anti-Phishing Protection,Advanced Security ,Automatic Updates
6) SquirrelMail: WebMail
Why? SquirrelMail is a standards-based webmail package written in PHP4. It includes built-in pure PHP support for the IMAP and SMTP protocols, and all pages render in pure HTML 4.0 (with no JavaScript required) for maximum compatibility across browsers. It has very few requirements and is very easy to configure and install. SquirrelMail has all the functionality you would want from an email client, including strong MIME support, address books, and folder manipulation.
7) RoundCube Webmail
Why? Easy to install/configure, latest web standards such as XHTML and CSS 2, Multilingual capabilities,Full support for MIME and HTML messages,Compose messages with attachments, Multiple sender identities, Basic address book,Find-as-you-type address book integration,Forwarding messages with attachments,Create or remove custom message folders,Built-in caching for fast mailbox access,Support for external SMTP server,Advanced user interface,Unlimited users and messages,Complete customization with skins
8) Amavisd-new: interface with AV. AS.
Why? amavisd-new is a high-performance interface between mailer (MTA) and content checkers: virus scanners, and/or SpamAssassin. It is written in Perl for maintainability, without paying a significant price for speed.
9) Simscan : qmail interface
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Why? Simscan is a simple program that enables qmail-smtpd to reject viruses, spam, and block attachments during the SMTP conversation so the email never makes it into your computers. It is completely open source and uses other open source components. Very efficient and written in C
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