made Post look for the "sender" of the message like this: check for

the envelope sender  and use it if it is found, otherwise, use
msg.GetSender().
This is one of the many places where mailman checks the "sender" by
looking for the sender header, which isn't as authoritative as the
envelope sender if that's available from the unixfrom line.  the
sender is a header, the envelope sender is from the smtp transaction.
Got bit hard by this one because a profane message posted to a 3k list
through a forwarding address that should have been flagged as
requiring approval wasn't because the forwarding address set the
sender header to something other than the envelope sender, and what it
set that too happened to be an approved address.
scott

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