false positives on rule "FM_RATSIGN_1106" and what to do?

Scott Silva ssilva at sgvwater.com
Tue May 29 20:45:26 IST 2007


Chris Yuzik spake the following on 5/29/2007 12:30 PM:
> Hi,
> 
> Suddenly, I'm seeing quite a number of false positives on the rule
> "FM_RATSIGN_1106" that gets a whopping 3.8 points. I've tried to figure
> out what exactly it's hitting on, but the only thing I found was:
> 
>    ##{ FM_RATSIGN_1106
>    meta     FM_RATSIGN_1106    (__MSGID_VGA && __DATE_700)
>    describe FM_RATSIGN_1106    Fingerprint seen in lots of spam. 11/2006
>    ##} FM_RATSIGN_1106
> 
> I think I need to set this rule down to 0.01 for now, or does someone
> have a better suggestion?
> 
> Thanks
> 
It looks at messages that hit both MSGID_VGA and DATE_700
Message-ID =~ /^<000001c[67]/  and date is -7 hours

It is in 72_active.cf.
So if you are getting false positives it might be that you deal with a lot of
mail from a time zone that is 7 hours behind you. If it hits that much, you
could score lower.

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