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DNSBL: how does it work, and how to create and build an own

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A DNSBL is a DNS based [DNS = Domain Name System] blackhole list, which can be used as countermeasure against unwanted mail spam. One of the most efficient ways to block mail spam is to do it on mail server level by denying incoming connects from spam sources, where the contacting remote machine is identified by its IP address … Read more

Building a Poor Man’s Barracuda – cPanel edition

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This article will show you how to replicate most of the functionality of a Barracuda Spam Firewall on you cPanel server. The BSF has 12 layers that messages would be process through as illustrated in the graphic below. I’ll show you how to replicate most of these steps using customizations to the Exim and Spam Assassin. This … Read more