[mailto:ietf-dkim-bounces(_at_)mipassoc(_dot_)org] On Behalf Of Paul Hoffman
The receiver *could* honor the signature forever, just as
they can with an x= tag. But, in doing so, they would be
going against the semantics of the DKIM signature.
I think it is necessary to distinguish between protocol semantics and court
room semantics.
The x= tage would do nothing to change the significance of the signature in
a court of law. People seem to have the idea that putting x= would allow
repudiation after the time expired, it does not.
I don't see that it has any relevance to protocol semantics unless a mail
server starts re-injecting old mail, as occasionally happens. Every so often
an old machine is rebooted and starts executing the old mail queue.
If a party wants the x= semantic the easiest way to do it is to roll their
key distribution points (they can even use the same key).
smime.p7s
Description: S/MIME cryptographic signature
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