Anti-Virus options

[Ed Weinberg]

I have seen the anti-virus options listed on the qmail.org site and looked at
the documentation on vendors sites.  I was wondering what the advantage was of
installing the anti-virus add-ons to Qmail (like Qmail-Scanner) when you can just run 
most of
the mail scrubbers as a daemon which  listens to port 25 and sends good eamail
to some non-standard p;ort where qmail-smtpd (via tcpserver) can be listening?

  --  Ed