 | SpamAssassin
Free Open Source mail filter, written in Perl, to identify spam using a wide range of heuristic tests on mail headers and body text. Spamassassin can also include blacklists, Razor, Pyzor, DCC and uses a bayesian filter.
|
 | Distributed Checksum Clearinghouse
System of clients and servers that collect and count checksums of email messages in order to detect and filter bulk UCE. |
 | Pyzor
Open source collaborative spam filtering system using digests of messages to identify spams. |
 | Vipul's Razor
Collaborative spam filtering network allowing users to report and filter out matching spam. |
| Activator Mail
Virus scanning and spam prevention based on blacklists and user feedback. |
| AppRiver Spam Filtering
An email security company offering hosted spam and virus protection and a scanning engine especially for OEMs. |
| ASSP
Anti-Spam SMTP Proxy implementing platform independent email filtering services. |
| BopSpam
Online POP3 bayesian filtering service. |
| Clapf
An open source email content filter application. Clapf is a modular statistical antispam application with an interface to popular antivirus programs. |
| CleanMailOnline
Online Spam and Virus Filtering, filter before mail reaches your computer. |