If a message is either rejected (during the SMTP dialog) or bounced (after accepting and queueing the message) then the same innocent third party receives some junk mail.[1] The difference is only in which server is sending the bounce message.
The presumption being, of course, that the other side is a real MTA and not the virus/worm itself. Rejecting is acceptable as the onus is on the other side on what to do. You're not generating the bounce. If it is a virus/worm then it isn't likely to generate a bounce. If it is an MTA then they had best get their act together and not propigate viruses.
--
Steve C. Lamb | I'm your priest, I'm your shrink, I'm your
PGP Key: 8B6E99C5 | main connection to the switchboard of souls.
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