Sysop:ServerMailSpamAntivir

HowTos

• Fairly-Secure Anti-SPAM Gateway Using OpenBSD, Postfix, Greylisting, Amavisd-new, SpamAssassin, Razor and DCC
• Exim SpamAssassin at SMTP time
• SpamFiltering with exim
• Fight back against spam with EximConfig and SA-Exim!
• gentoo howto
• Postfix + Amavis/ClamAV + DSPAM, Mailfilter Gateway
• NixSpam in Spamassassin einbauen
• JPG/GIF/PDF spam what can you do?
• http://khopesh.com/wiki/Anti-spam Describing various techniques.

Amavis

• sysop:Amavis

Spamassassin

• http://spamassassin.apache.org

rules

• http://rulesemporium.com/
• http://sandgnat.com/rdj/rules_du_jour

documentation

• dcc installation: http://konabi.de/artikel/artikel_content.php?artikel=dcc
• spamassasin config generator: http://www.yrex.com/spam/spamconfig.php

Links

• http://bogmog.sourceforge.net/document_show.php3?doc_id=28
• http://spamassassin.apache.org/index.html
• http://spamassassin.apache.org/full/3.1.x/dist/doc/Mail_SpamAssassin_Conf.html

Razor2

• http://razor.sf.net
• http://www.rhyolite.com/anti-spam/dcc/

Pyzor

• http://wiki.apache.org/spamassassin/UsingPyzor
• http://pyzor.sourceforge.net/

Greylisting

Greylisting Beispiel Setup

• About Greylisting: [1] [2]
• Greylisting with Exim4 (Debian): [3]
• Greylisting Exim4 and Postgres: [4]
• Greylisting Exim4 and MySQL: [5] [6]
• Postgrey - Postfix Greylisting Policy Server: [http://isg.ee.ethz.ch/tools/postgrey/

Whitelisting

To avoid that valid hosts are greylisted and therefor mails are delayed, we simply can use whitelists to accept before greylisting them. A good source of legitimate mail servers is DNSWL

exim config

Place in the correct acl, mostly right before the Greylisting:

   accept  domains       = +local_domains
           dnslists      = list.dnswl.org
           logwrite = $sender_host_address is whitelisted