Over the past several weeks our level of spam has doubled and a good majority of it isn't failing enough tests to be blocked based on my settings. The problem is that a good deal of it isn't failing ANY tests or only helobogus and ipnotinmx. I can't really block on helobogus or ipnotinmx alone because I would have a great deal of false positives. One test that a few of the emails fail is SBL. Is anyone effectively blocking on SBL alone? Are there any other methods being used other than the declude tests? I have tried using keywords but it tends to generate too many false positives. There are a few people who are receiving over 30 spams a day and that is just unacceptable considering we are running antispam software. Any suggestions would be appreciated.
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