Linux Mail Server Setup and Howto Guide

The Barracuda Spam Firewall is a Linux based anti spam network appliance dedicated to fighting spam and viruses. Unlike Postgrey which greatly reduces spam but at a cost of delays to your mail, the Barracuda Spam Firewall performs a battery of test to eliminate spam without any costly delay.

Postgrey is a simple and powerful anti-spam tool for Postfix. It works by using a technique called Greylisting. Adding greylisting in Postfix will give your Postfix mail server a simple and effective first line of defense against spam, at a cost of a few minor delays for newly identified senders.