A client who is more on top of things than the average has noticed some
mailings to him that have two DKIM signatures, and wondered whether there was
some advantage to that.
Of the two samples he sent, it was clear that one had been signed by an MTA
that relayed through another service, which also signed the message. The
other might have been signed twice by the same MTA; the headers were
ambiguous.
So far I have not found much one way or another after a googleslog, although
one system was reported as taking off good-guy points for multiple signatures.
Any comments?
mdr
--
"There are no laws here, only agreements."
-- Masahiko
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