From: "David F. Skoll" <dfs(_at_)roaringpenguin(_dot_)com>
...
content-scanning shouldn't be a problem. The only drawback is what I
alluded to in a previous post: SMTP doesn't allow success for some
recipients and failure for others at the end of the DATA phase.
...
There are existing solutions to that problem. One is to reject with
a 4yz temporary failure codes any Rcpt_To address whose filtering
preferences might yield a different answer than the preferences of
the first recipient.
A second solution is to resolve conflicts in the correct answer to
the DATA command with a 2yz OK answer but to deliver only to mailboxes
that want the message and silently discard instead of rejecting the
message for other mailboxes.
The first is clearly correct and complete, but I've chosen the second
for the sendmail milter DCC client on perhaps dubious efficiency grounds.
Vernon Schryver vjs(_at_)rhyolite(_dot_)com
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