To known users.
that's a bitch, as always.
you harvest the IPs from the imail log, and do tcp-block of the highest volume IPs and/or ClassCs at your packet filter (use PktFilter right on the Imail box).
and/or
do content-scanning where the rule-match action is DISCARD (accept and silently drop) rather than REJECT (don't accept). You don't want to reject known virus msgs, since that makes you an accomplice in the virus propagation.
Len
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