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MailCleaner Open Source Edition is now discontinued but will continue under the spamtagger project
https://github.com/SpamTagger
[antispam] MailCleaner is an anti-spam / anti-virus filter SMTP gateway with user and admin web interfaces, quarantine, multi-domains, multi-templates, multi-languages. Using Bayes, RBLs, Spamassassin, MailScanner, ClamAV. Based on Debian. Enterprise ready.
MailCleaner is an anti spam gateway installed between your mail infrastructure and the Internet.
It includes a complete GNU/Linux OS and a graphical web interface for user and administrative access. ...
...It offers Web content filters, ensuring better performance of the network, allowing users to use the service efficiently and securely, providing a deep control of the use of the Web access service, blocking access to unwanted websites, Virus, Spam, Applications and intrusion attempts. Its configuration is made entirely by the web interface.
...The feature suite includes stateful packet inspection firewall, application-level proxies for various protocols (HTTP, FTP, POP3, SMTP) with antivirus support, virus and spam-filtering for email traffic (POP and SMTP), content filtering of Web traffic and a "hassle free" VPN solution (based on both OpenVPN and IPsec).
Mailfilter is a flexible utility for UNIX (-like) operating systems to get rid of unwanted spam mails, before having to go through the trouble of downloading them into the local computer. It offers support for one or many POP accounts.
SSL Signature Check (SSLSigcheck) is an email filter designed to be run from within procmail. It will examine the signature and certificate of a signed email, and add header information that procmail recipes can use to filter the message.
Is your server running slowly? Clamav-sniffer could help - it scans for malware such as phishes and viruses and configures your firewall to block the cracker.
Untangle is a Linux-based network gateway with pluggable modules for network applications like spam blocking, web filtering, anti-virus, anti-spyware, intrusion prevention, bandwidth control, captive portal, VPN, firewall, and more. Visit http://untangle.com
mod_dnsblacklist is a Lighttpd module that use DNSBL in order to block spam relay via web forms, preventing URL injection, block http DDoS attacks from bots and generally protecting your web service denying access to a known bad IP address.
SpamCheetah is an OpenBSD greylisting based spam filter. It is a liveCD that can run on any machine and it does not modify your hard disk or anything else. It is a network level spam filter and you have to run a separate mail server with it.
NOTE: dkim-milter has been replaced by OpenDKIM, available at http://opendkim.org/
dkim-milter consists of two parts: A milter-based application (dkim-filter) which plugs in to Sendmail to provide DomainKeys Identified Mail service, and a library (libdkim) which can be used to build DKIM-compliant applications or MTAs.
dk-milter consists of two parts: A milter-based application (dk-filter) which plugs in to Sendmail to provide DomainKeys service, and a library (libdk) which can be used to build DomainKeys-compliant applications or MTAs. See the home page for details.
P3Scan is a fully transparent scanning proxy-server for email clients. It provides scanning of incoming/outgoing email messages for Virus''s, Worms, Trojans, Spam, and harmfull attachments. It can also parse messages for web-bugs.
OSN is an open source open protocol distributed social network. Public key cryptography makes the network resilient to spam. User profiles are based on FOAF XML and users can migrate their profile from one site of the federation to another.
ClamMail is POP3 email proxy for Windows with integrated ClamAV antivirus engine.
ClamMail is an Windows antivirus that protects your PC from viruses transferred via mail. Works with Outlook,Thunderbird,Eudora and many others using popular POP3 protocol
dkfd is a DomainKeys filter daemon using libdomainkeys library. targeted usage is SMTP proxy of Postfix MTA. Currently developing under Linux/FreeBSD, and Solaris.
This project is named PSCM, an acronym for POSTFIX, Spamassassin, ClamAV, Mailscanner. It is an integrated RPM package featuring a SMTP mail server, with spam filtering and virus scanning capabilities, designed for easy installation and usage.
Keychain Framework is an Objective C Foundation-based framework for accessing Keychain and Security services under MacOS X. It provides convenience wrappers around the CDSA library included with MacOS X, facilities for manipulating keychains, and more.
Mailcash if a plugin for Apple's Mail program that provides hashcash support - that is, verification and generation of hashcash stamps. Refer to <http://www.hashcash.org/> for more information about Hashcash.
ClamSMTP is an SMTP filter that allows you to check for viruses using the ClamAV anti-virus software. It accepts SMTP connections and forwards the SMTP commands and responses to another SMTP server. Works well with Postfix.