multi-volume RAR archive problem

[Curu Wong]

Strictly speaking, I am not sure if this is a problem.

We can create multi-volume(split volume) RAR archive with the WinRAR, and
send them out one by one via email. When one message arrives at MailScanner,
it will try to unpack that volume(part of the complete archive), which
should definitely fail. and then ms restart itself and try and fail and try
and fail, then give up processing that message, block it.

My question is, what's the better solution? can we tell if a RAR archive is
multi-volumed and just skip processing it? Is it a good policy to restart ms
itself(due to external failure) and do the exact same(should always fail)
action toward the offending message?
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