Rspamd is fast, modular and lightweight spam filter. It is designed to work
with big ammount of mail and can be easily extended with own filters written in
OpenVISP Stats is a very simple mail statistics RRDtool frontend for mail
statistics that produces daily, weekly, monthly and yearly graphs of
received/sent, bounces/rejected, spam mails, viruses, ... and pop/imap
Scam-backscatter prevents spam backscatter (accept and bounce) on
mail servers which don't host mailboxes locally. It validates
mailboxes by verifying the recipient addresses hosted on a different
spamass-milter is a plugin for the Sendmail Milter (Mail Filter) library
that pipes all incoming mail (including things received by rmail/UUCP)
through the SpamAssassin, a highly customizable spam filter.
SQLgrey is a postfix policy service implementing a grey-listing policy.
SQLgrey is written in Perl and uses DBI to access an SQL database.
Its goal is reducing the SPAM reaching user mailboxes
A mail scanning daemon for Postfix written in Python. It acts as the
glue application between the MTA and spam checkers and antivirus
software and focuses on being solid, easy to manage, debug and monitor.
Tagged Message Delivery Agent (TMDA) is designed to significantly reduce the
amount of spam (junk-mail) you receive. TMDA strives to be more effective,
yet less time-consuming than traditional spam filters.
The technical countermeasures used by TMDA to thwart spam include:
- whitelists: accept mail from known, trusted senders
- blacklists: refuse mail from undesired senders
- challenge/response: allows unknown senders which aren't on the whitelist or
blacklist the chance to confirm that their message is legitimate (non-spam)
- tagged addresses: special-purpose e-mail addresses such as time-dependent
addresses, or addresses which only accept certain kinds of communication.
These increase the transparency of TMDA for unknown senders by allowing them
to safely circumvent the challenge/response system.
TMDA can also be used as a general purpose local mail delivery agent to filter,
sort, deliver and dispose of incoming mail.
The reCAPTCHA  is a service that provides captchas for preventing
automated spam in web applications. The recaptcha-hs provides functions
for using reCAPTCHA in Haskell web applications.
Allows you to manage multiple Gmail accounts and receive new mail
notifications. Displays your account details including unread messages,
saved drafts, spam messages, labels with new mail, space used, and new mail
This plugin enables the scanning of incoming mail received from a POP,
IMAP, or LOCAL account using SpamAssassin. It can optionally delete mail
identified as spam or save it to a designated folder, and also can be used
to train a local SpamAssassin (or a remote one if SpamAssassin >= 3.1 is
installed both locally and remotely). According to your SpamAssassin server
configuration, it can show worse performance than Bogofilter, (slower,
eating more CPU), but can catch spam with better accuracy.