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Old 20th January 2011, 01:50
till till is offline
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There are a lot of additional extensions and rulesets available.

http://wiki.apache.org/spamassassin/CustomPlugins
http://wiki.apache.org/spamassassin/CustomRulesets

my defult ispconfig installation filters > 95% of the spam without any false positives. So if your system is less accurate in filtering, you might want to check the headers of the mails that had come trough to see which rules applied to them.
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Till Brehm
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