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spamassassin and required_score - how low do you (dare) go?

Discussion in 'General Discussion' started by spaceman, Jan 15, 2007.

  1. spaceman

    spaceman Well-Known Member

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    G'day.

    Has anyone configured Spamassassin with a required_score of less than 5 - and if so, how low have you gone?

    The lower this number, the more aggressive Spamassassin becomes, and the higher the chance of false positives.

    Does anyone know if tests have been run on Spamassassin that says something like:

    Spamassasin
    required_score ave. false positives
    8 .................. 0.01%
    7 .................. 0.05%
    6 .................. 0.08%
    5 .................. 0.1%
    4 .................. 0.2%



    Thanks.
     
    #1 spaceman, Jan 15, 2007
    Last edited: Jan 15, 2007
  2. Lyttek

    Lyttek Well-Known Member

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    I'm running at 3 currently... with a false-positive rate that's quite a bit lower than avg
     
  3. spaceman

    spaceman Well-Known Member

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    Thanks for that. We've got one client on '4' and am debating whether to go lower...
     
  4. SageBrian

    SageBrian Well-Known Member

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    I'm comfortable with the 5.

    The image filters are a pain because so many people feel the need to use their fancy 'stationary' backgrounds in emails, and their logos in the footers.
    So, some valid emails have been getting scores.

    Add in the 'forgetfulness' (or idiocy) of those that don't use Subjects, or use All Caps, and some mail gets very close to that 5 mark.

    Then again, just marking it as spam is ok I guess. My personal settings just delete anything over 5. :)
     
  5. ramprage

    ramprage Well-Known Member

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    I keep mine at 4.8 this does a nice job.
     
  6. wa4fat

    wa4fat Well-Known Member

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    SA Score strategy that works

    On our servers, we recommend clients use an SA low-scoring threshold of 3 or 4, and a high-scoring threshold of 8 or 10. In addition, we *strongly* encourage our clients to send their low-scoring spam to a spam mailbox which they check regularly for false positives.

    Personally, I have my low-scoring threshold at 3 and delete everything above 8. Mail scoring between 3 and 8 is deposited to a spam mailbox which I check regularly with MailWasher (an excellent application for this use). Combined with an intelligent use of whitelisting, false positives are extremely low, and false negatives are also almost non-existent.

    I am constantly tweaking our server's SA scoring, and also have a variety of custom rulesets to enhance SA, or to catch topical attacks (such as the current flood of virus-infected mail with 'Chinese missile' subjects.)

    You can view our latest SA ruleset here: http://cahaba.net/local.cf

    Cheers // Bill
     
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