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I have been using qsf to augment spammassassin and it's been fairly good (this system is running a very old setup and newer versions of spammassassin won't run on it). I get very rair false positives, maybe one or two a months (it's easy to tell qsf that these are good) and maybe 12 to 15 false negatives (i.e. spam that gets to my inbox) a day. This is not a problem for me as I don't mind a handfull of spam getting through when it catches the 250 a day (that's ontop of the 350-400 a day that spammassassin gets). If I am ever able to upgrade this box to a more current version I think that smappassassin will be enough but will probably keep qsf as a backup.

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