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Fine-tuning SpamAssassin
Tuesday, 31 August 2004, 09:26 GMT

SpamAssassin, as most of our readers will know, is a popular spam classifier on Linux. This article assumes that you already have SpamAssassin installed and working. If you are interested in running SpamAssassin, but do not yet have it set up, there is a useful introduction at http://linux.org.mt/article/killspam.

When I set up SpamAssassin in Mandrake 9.2, it came very close to picking up 100% of my spam. Over time, however, many of the spammers have figured out how to fine tune their spam and bypass the default ruleset. I find the default setup still picks up at least half the spam, maybe two thirds on a good day, but too much leaks through. If the spammers are tuning their messages, I guess the only thing to do is to tune my scoring. There are at least 8 possible ways of improving SpamAssassin's hit rate.

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