I use a program called ASSP to filter spam and viruses. It seams to work really
well. see http://assp.sourceforge.net for more info.
Dave
Quoting Jeff Brenton <jbrenton@xxxxxxxx>:
> Hello Paul,
>
> >> If you program the MTA to accept-analyze-drop messages, you risk a
> >> false positive not being noticed; if the MTA rejects a legitimate
> >> message, the sender will not get a report about the error.
>
> PJS> What risk of false positives wrt virus-scanning? Are
> PJS> virus-scanner so unreliable as to generate false positives? Can
> PJS> you back up this assertion? I'd be most interested in hearing
> PJS> about this. False positives in virus-scanner usually indicate a
> PJS> bug in the signatures.
>
> I was speaking to the generalized case of filtering, which includes
> spam filtering. If a legit message is tagged as spam by an MTA that
> then drops it (rather than bouncing), the sender doesn't know about
> it, until they realize they never got a response. Since you can't
> trust the envelope sender nowadays, bouncing a message after you've
> accepted the message and sent a "250 OK" is a bad option.
>
> I guess the proper way to do this is to receive the message, process
> it through all filters, THEN acknowledge the receipt to the sender. I
> just don't like the idea of allowing all my bandwidth to be used up
> receiving something I could reject earlier in the process... B-)
>
> False virus positives are less prevalant today than they were 5 or
> more years ago. I remember having to disable Norton AntiVirus for a
> few weeks in the early 1990's because it insisted that one of the most
> popular access programs for CompuServe was a virus...
>
> --
> Jeff Brenton
> Vice President,
> Engineered Software Products, Inc
> http://espi.com
> Questionable web page: http://dididahdahdidit.com
>
> Liberalism grants you the freedom to advocate any idea*.
> * Please see http://www.dididahdahdidit.com/except.php for a
> current list of exceptions
>
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