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.
(more…)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. To install Postgrey, we are going to use the precompiled binaries from Dag Wieers RPM packages for Red Hat, RHEL, CentOS and Fedora.
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