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SALAMI is a lightweight mailing list server. It uses freemail accounts (with SMTP/POP3 access) to receive and distribute the eMails. Hence SALAMI is intended to run on dynamic internet hosts such as routers.
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PHPMailTo: is a PHP processor for email address links, it attempts to thwart the practices of spammers who harvest emails. It does not suffer from the flaws of other popular practices like JavaScript fixes, mailto: modifications or Unicode translations.
SpamWizard is a statistical spamfilter working at serverlevel. It's based on Paul Grahams essay "A Plan for Spam", and has evolved to include several other features and filtering techniques. Supports *nix platform.
This library extends SUN's JavaMail API by an PGPMime framework. It acts as a middleware layer between a cryptography provider like GnuPG or Cryptix OpenPGP Provider and JavaMail.
SWM (Secure WebMail) is an applet that provides confidentiallity and authentication in webmail applications using SHA/RSA algorithms. It can accompany virtually every webmail application, but comes with a plugin for squirrelmail and can run standalone.
A web-based helpdesk ticketing system. It adopts a more effective ticket sorting/ranking method instead of the cumbersome "assign/completed". More: http://www.upoint.info/cgi
A small Perl script which interacts with an IMAP server that responds to email requests for a web page, delivering them back to the sender as an attachment.
Jwapmail is opensource wap (wml) based email client (wapmail) written in PHP using IMAP protocols to communicate with the mailbox server.
Jwapmail is compliance to RFC2060 and RFC822. Jwapmail doesn't use php-imap library.
Dougal is a Free (LGPL) mail-washing program for the POP3 protocol, written in Perl. It supports any operating system that supports Perl 5.x and TCP/IP (Perl IO::Socket module).
Webmail with HTML message reader and HTML message writer:
Reliable and very light on your server. Uses Perl 5.0 +
any cgi-capable webserver apache/thttpd/etc.
getmail.com downloads mail from your mail.com account. It handles all known (to me) mail content types, including multipart with attachments. You can specify the max size of messages to download.
Vorpal Mail is a Mail Transfer Agent (MTA) intended to replace sendmail. It's aims are to be easy to configure and manage, whilst providing powerful features (Virtual Domains etc.).
A little mail agent that can check if you have Mail waiting to be read on the server. He have lot of option like exclude mails with something in the subject, multiple accounts, ... It's a GTK+-2.0 based GUI.
QSpamDog is a PHP-based email filter which is intended to be used
primarily in filtering spam email. It was designed for usage with
QMail based email-servers which use the Maildir format for storing
users' emails.