Some relevant pointers about Mail servers and Mail filtering

Wikipedia Milter

Projet Plume - and j-chkmail

• Sendmail Milter
  
• Postfix Milter

• milter.org - An interactive catalog of sendmail mail filters
• libmilter documentation
  • At |milter.org (official)
  • Or j-chkmail.org (local copy)

• ClamAV

• Microsoft Unsafe files

• Greylisting - The Next Step in the Spam Control War - Evan Harris web site about Greylisting, and his implementation (relaydelay). This is the reference site about greylisting

• SURBL - Spam URI Blocklist

• Brian Costales, sendmail Milters: A Guide for Fighting Spam

• Brian Costales and Eric Allman - sendmail

• Bruno Rasle and Frédéric Aoun - Halte au Spam - a very good french book about spam.

• Alternative libmilter - This is a modified libmilter using a pool of workers instead of one thread per SMTP connection. This allows to drastically reduce the number of threads in the filter : interesting if your server handles lots of simultaneous connections. This implementation of libmilter was integrated on sendmail 8.14.0 and received an Innovative Open Source Contribution award from sendmail.

• Mail tools

• Vigilog - a set of perl scripts to process Cisco Routers log files and detect scans.

• j-sophosd a daemon virus scanner using Sophos savi library (not included) to use it with j-chkmail release 1.7 and newers. This is a prototype.

• sympa-milter