This doesn't look possible from the man page, but I have to ask. Can
restriction classes or something like it be used with *canonical_maps?
After the recent discussion of spammers sending mail From:
bigbossmydomain, I realized that my sender_canonical_maps would rewrite
the incoming, fake From: address into canonical form. :-)

I would like to identify a message from my network (using information sent
recently about checking outgoing domains) and rewrite its From: address to
canonical form. For messages from the Internet, I would like to rewrite
any someonemydomain addresses to something that includes a warning
message that it may be forged.

----
Russell Mosemann, Ph.D. * Computing Services * Concordia University, Nebraska
"I hesitate to articulate for fear of deviating from the path
 of rectitude."
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