amavisd-newHigh-performance interface between the MTA and content checkers.
anomy-sanitizerPerl based e-mail filtering tool, sensitive to html tags, mime types and attachments
anubisGNU Anubis is an outgoing mail processor.
askActive Spam Killer: A program to filter spam
asspAnti-Spam SMTP Proxy written in Perl.
bmfA fast and small Bayesian spam filter
bogofilterBayesian spam filter designed with fast algorithms, and tuned for speed.
clamassassinclamassassin is a simple script for virus scanning (through clamav) an e-mail message as a filter (like spamassassin)
clamsmtpClamSMTP is an SMTP filter that allows you to check for viruses using the ClamAV anti-virus software.
couriersrsSRS (Sender Rewriting Scheme) wrapper for the courier MTA.
dccDistributed Checksum Clearinghouse
disspamA Perl script that removes spam from POP3 mailboxes based on RBLs.
dkimproxyAn SMTP proxy that signs and/or verifies emails using the Mail::DKIM module
dovecot-antispamA dovecot antispam plugin supporting multiple backends
dspamA statistical-algorithmic hybrid anti-spam filter
gldA standalone anti-spam greylisting algorithm on top of Postfix
imapfilterAn IMAP mail filtering utility
libdkima library to verify and create signatures of e-mail headers
libmilterThe Sendmail Filter API (Milter)
libsieveA library for parsing, sorting and filtering your mail.
libspf2libspf2 implements the Sender Policy Framework, a part of the SPF/SRS protocol pair.
libsrs2libsrs2 is the next generation Sender Rewriting Scheme library
libsrs_altSender Rewriting Scheme library
maildropMail delivery agent/filter
mailfilterMailfilter is a utility to get rid of unwanted spam mails
MailScannerFree Anti-Virus and Anti-Spam Filter
mapsonA challenge/response-based white-list spam filter
milter-greylistMilter-greylist is a stand-alone milter that implements the greylist filtering method
milter-regexA milter-based regular expression filter
mimedefangA program for Milter supported mail servers that implements antispam, antivirus, and other customizable filtering on email messages
normalizemimeHelper program to normalize MIME encoded messages
opendkimA milter-based application to provide DKIM signing and verification
p3scanThis is a full-transparent proxy-server for POP3-Clients.
policydPolicy daemon for postfix and other MTAs
policyd-weightWeighted Policy daemon for Postfix
popfileAnti-spam bayesian filter
postgreyPostgrey is a Postfix policy server implementing greylisting
procmailMail delivery agent/filter
procmail-libProcmail Module Library is a collection of modules for Procmail
pypolicyd-spfPython based policy daemon for Postfix SPF checking
qmail-scannerE-Mail virus scanner for qmail.
razorVipul's Razor is a distributed, collaborative spam detection and filtering network
rblcheckPerform lookups in RBL-styles services.
scmaila mail filter written in Scheme
sid-milterA milter-based application to provide Sender-ID verification service
sieve-connectSieve Command Line Interface
spamass-milterA milter for SpamAssassin
spamassassinSpamAssassin is an extensible email filter which is used to identify spam.
spamassassin-botnetSpamAssassin plugin that attempts to detect messages sent by a botnet
spambayesAn anti-spam filter using on Bayesian filtering
spamdykeA drop-in connection-time spam filter for qmail
spampdspampd is a program used within an e-mail delivery system to scan messages for possible Unsolicited Commercial E-mail content.
spamprobeFast, intelligent, automatic spam detector using Bayesian analysis.
sqlgreySQLgrey is a postfix policy service implementing a grey-listing policy
tmdaPython-based SPAM reduction system