If virus, don't scan with SA

Scott Silva ssilva at sgvwater.com
Wed Jul 23 23:56:35 IST 2008

on 7-23-2008 3:34 PM Chris Barber spake the following:
> on 7-23-2008 12:59 PM Chris Barber spake the following:
>> Hi All,
>> I was wondering if the following is possible with MS:
>> If a message can be virus scanned first, and it found to be a virus, 
>> can SA scanning be skipped?
>> The reason I ask is that I use the sanesecurity signatures for clamav.
>> If sanesecurity says it is spam/phish/etc then no need for SA 
>> processing taking up resources.
>> On a side note, to date I have never had a false positive with these 
>> signatures.
>> Thanks much,
>> Chris
> If you want to virus scan first, run a milter. That way you can drop it at the smtp phase.
> Personally, I have had false positives with the sane sigs, but it has been when they posted a bad signature, and they fixed it quickly.
> That is not a bad idea using a milter. Only issue is that I use MailWatch with daily reports, users like to see that viruses are being blocked. I'll have to think about this one.
> Thanks
You can't really do it in mailscanner, since it scans in batches and it is 
hard to control if spams and viruses are mixed in a batch. Here at least, the 
percentage of things that hit the sane sigs is small as a percentage of total 
spam. So having 1% or less of your spam get skipped is not that big of a deal. 
Maybe you could run messages through a milter like mimedefang and just add a 
header. Then you could use a custom function to not scan those messages. But 
it is a lot of work for a small return.

MailScanner is like deodorant...
You hope everybody uses it, and
you notice quickly if they don't!!!!

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