The primary deployment scenario for DKIM is to do the signing on the
submission server, so the signature doesn't necessarily identify the
message's author. I'd say the tag you want has at least three settings:
author / submission server / re-sender
A submission server might be in a good position to sign a message on
behalf of the submitter, but it seems awkward at best to expect a
submission server to distinguish between original messages and re-sent
messages. And at least at this point, I don't see any particular reason
to distinguish submission from re-submission.
; and perhaps also smart host /forwarder / list server. Etc. etc.
I also don't see how it's necessary or particularly desirable for the
signature to distinguish between different kinds of (re)sending.
Keith
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