Linux Mail Server Setup and Howto Guide

This page will guide you in configuring MailScanner, ClamAV and SpamAssassin to work in Postfix. Before proceeding, make sure Postfix is installed and working.

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.

Starting with version 4.61.7-2 of MailScanner, MailScanner can now talk directly to the Clam AntiVirus clamd daemon. Previously, an executable program called clamscan, specified by setting Virus Scanners = clamav in the MailScanner configuration file, was launched to perform virus scanning. This process required so much overhead to perform.

This page will guide you in configuring MailScanner, ClamAV and SpamAssassin to work in Postfix. Before proceeding, please make sure that all of the above components are already installed.

To install Clam AntiVirus (ClamAV), we are going to use the precompiled binaries from the EPEL repository.

For more efficient virus scanning in MailScanner, we can use the Perl ClamAV Module. To do this, we need to install the required Perl modules. Here are the steps to do this.

1. In the Terminal window, type in the commands below.

perl -MCPAN -e shell

This will activate the interactive mode for locating, download and building perl modules from CPAN sites. CPAN stands for Comprehensive Perl Archive Network. CPAN sites contains a large collection of Perl softwares and documentations.

This article will guide you in configuring MailScanner, ClamAV and SpamAssassin to work in Postfix. Before proceeding, please make sure that all of the above components are already installed.

To install Clam AntiVirus (ClamAV), we are going to use the precompiled binaries from Dag Wieers RPM packages for Red Hat, RHEL, CentOS and Fedora. To do this, we are going to configure Yum to look for the ClamAV packages in Dag’s repository.