How To Fight Spam Using Your Postfix Configuration

In this guide you will learn how to tweak the mail guide for  Postfix (+Auth SMTP + Quota), http://www.howtoforge.com/virtual_postfix_mysql_quota_courier, setup to better combat SPAM and allow a little bit of backward compatibilty of the older Qmail systems.

Postfix Spam Filter using Ubuntu Dapper, MailScanner, SpamAssassin, Rayzor, Pyzor, DCC and ClamAV

This is a similar version of the HOWTO that can be found here: http://www200.pair.com/mecham/spam/spamfilter20050628.html. Except for using Ubuntu Server instead of Debian and MailScanner instead of Amavisd, the Postfix, Rayzor, Pyzor, DCC and ClamAV sections are almost the same.

Killing That Spam With Postgrey And Postfix

Ever heard of stopping spam with greylisting?

This tutorial will show you how to setup greylisting with Postgrey and Postfix on Debian. Greylisting will not replace spam filtering software like SA but it will serve as a powerful first hurdle for spam thus reducing the ammount of spam entering the system at all.

Mandriva 2005 Postfix Anti-Spam, Anti-Virus Relay Server for Exchange Server 2000/2003

There are a couple of linux how-tos floating on the Internet that deal with this very subject. As a matter of fact, those guides are what inspired to write this one. In the spirit of keeping it simple, let me recommend the Mandrake or as it’s currently known Mandriva Linux distro. This guide has been written with this distro in mind.

How To Automate Spamcop Submissions

Spamcop is a service which provides RBLs for mailservers in order to reject incoming mail from spammers.

Their philosophy is to process possible spam complaints from users. When they receive a certain amount of complaints during a time-period then they will blacklist the offender. This system is dependant on spam reporting from users. However, their submission process is not very user-friendly [...]

Add Mailfiltering to the Falko howto Postfix Guide 

In this guide, you will learn how to get around some of the security policies that Postfix affords in favour of quickness and speed.

The Falko guide shows us how to get Virtual users working with Postfix/ Courier IMAP however it would be nice to offer per user mail filtering on email marked as spam by Spam Assasin for example to go into a SPAM folder for example.

DSPAM is a scalable and open-source content-based spam filter designed for multi-user enterprise systems. It's great at filtering out spam but on busy mailservers the pruning of the MySQL databases takes way too long time. This small tutorial/hack can speed up the pruning of old data considerably.

Virtual Users And Domains With Postfix, Courier And MySQL (+ SMTP-AUTH, Quota, SpamAssassin, ClamAV)

This document describes how to install a mail server based on Postfix that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I'll also demonstrate the installation and configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier can authenticate against the same MySQL database Postfix uses.

SpamAssassin-ClamAV-Procmail-Howto

This document describes how to install SpamAssassin (for filtering SPAM) and ClamAV (for filtering viruses, trojans, worms, etc.) and how to invoke them by using procmail recipes. It is suitable for scenarios where Sendmail or Postfix deliver emails to local users. It should work (maybe with slight changes concerning paths etc.) on all *nix operating systems. I tested it on Debian Woody so far.