> >When running multiple scanners is their a way to prevent the other 
> >configured virus scanners from scanning the message if the 
> first virus 
> >scanner finds a virus?
> 
> No, there is not.  Given that all non-virus E-mails will be 
> sent through all scanners, the extra time used is minimal 
> unless a high percentage of your traffic is viruses.  We are 
> considering an option to let you stop scanning after the 
> first virus is detected.

Looking at the last 4 months 17% of the processed messages on our server are
virus infected. 
50% are Spam => without file attachments
If we assume that from the resting 33% of legit messages one quarter has a
file attachment, we have the following percentages for messages with file
attachments and so calling virus scanners:

~ 17% infected messages
~  8% legit messages

If every message triggers two virus engines stopping after the first
detection of a virus would significantly reduce virus checks by 34%
Running 3 virus engines it would cut down engine calls by over 45% 

=> with the same resources you can run a third scan engine


Markus


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