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I had originally written this tutorial for xmodulo.com In the world of mail servers, MailScanner is one of the best open source software for virus scanning and spam detection. MailScanner relies on pre-installed anti-virus and anti-spam software to check incoming and outgoing emails for malicious content or patterns of spamming. This makes sure that the mail server does not participate in the distribution of malware and unsolicited spam emails. It also helps preventing the mail server IP from becoming blacklisted, keeping the mail server records clean. This tutorial will focus on setting up MailScanner along with Clam Antivirus and SpamAssassin in a CentOS system. The procedure should work on RHEL as well. If you are interested in setting up this system on  Ubuntu , refer to  this tutorial  instead. Installing MailScanner is a lengthy process, but going forward step by step should make the deployment process easy. Preparing the System Before we start doing anyt...

I had originally written this tutorial for xmodulo.com . Antivirus and anti-spam protection are the among the most important security features for a mail server. Unix/Linux based mail servers are typically invulnerable to malware and viruses, and there is a very slim chance that the server itself may get infected. On the other hand, the operating system of an end user device may not always be so secured. We certainly do not want our mail server to accept or distribute malware embedded emails. So setting up antivirus software on a mail server is a must. Anti spam filters will inspect every incoming and outgoing mail for patterns of spamming. For example, spam mails usually contain a large number of recipients. Also, reverse DNS query for the domain in a spam mail does not always provide proper answers. If the spam filter software finds any mail that could be spam, it blocks the mail. This helps retaining the reputation of the mail server, as well as prevents the IP address of the...