Ok... we are going to use an outside MX forwarding service to scan all
incoming mail coming to the servers from other hosts for spam and viruses.
Now how can I lock things down so ONLY the users popping in for SMTP and the
filtering servers can have access?  I already have the pop-before-smtp
configured I just don't want to lock everybody out.  If I recall it is done
in tcp.smtp correct?


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