Alexey...
(I keep both headers and body of the message in the same file, so I am not
delighted with the idea of copying [potentially large] message on delivery
just
to add Resent-* flags).
You have to add a "received" line anyway, if you do it right. You can just
write the "resent-*" lines after the "received" line, and then pipe the rest
of the message through.
So I think that adding Resent-* fields should be SHOULD, not MUST.
In any case, I agree with this.
Barry Leiba, Multimedia Messaging (leiba(_at_)watson(_dot_)ibm(_dot_)com)
http://www.research.ibm.com/people/l/leiba