The Email Gateway we are going to be building here can be illustrated by the following diagram:\n\n[img[Overview of Email Gateway|overview.png]]\n\nNext: The_Tools

Any software or utility that is used to combat spam.

Any software or utility which is meant to combat viri. Specifically in this wiki, we are talking about anti-virus software.

!!Bayesian (http://www.paulgraham.com/spam.html)\nBayesian Learning Spam Filters are anything which uses an adaptive algorithm to “learn” what is and what isn't spam. In theory these can be highly effective spam filters over time as they improve. In practice, however, they tend to require more effort on the part of the user than is desired.\n\nThat being said, Bayesian filters can still be very effective and only add to the other components in this system, so they are included.

Expanding the system\n*[[Expanding_Spam_Filtration]]\n*[[Razor]]\n*[[DCC]]\n*[[Bayesian]]\n\n[[SpamAssassin_Scores]]\n\n[[Considerations]]\n

Configuring_Postfix\nConfiguring_SpamAssassin\nConfiguring_ClamAV\nConfiguring_Amavis\n\n[[Testing_the_system]]

Our final component to configure is Amavis. The main file we will be editing is the amavis configuration file {{{/etc/amavis/amavisd.conf}}}. This file is rather large, and there is a lot of