Greetings again. The following is similar to the earlier proposal but
adds normative text to the document that obviates the need for x=.
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Summary:
Remove the x= tag from the base spec because it conflicts with some
of the purpose of DKIM and adds unneeded semantics; add text to say
what DKIM signature lifetimes are supposed to be.
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Rationale:
DKIM permits a signing domain to assert responsibility for a message.
Saying "I only take responsibility for sending the message until this
time, and then I don't take responsibility even though I previously
took responsibility" makes little sense in the real world.
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Changes:
Add a new paragraph at the end of section 1.1:
A DKIM signature is intended to be verifiable for about the length of
time of that it would take to transport the message in SMTP; this is
almost always less than two weeks. The signature is not intended to
be used for archival purposes, and verification of the signature
after this period is not an intended or desired feature of the DKIM
protocol.
In section 3.5, remove the x= section. Also in section 3.5, remove
"x=1118006938;" from the example for z=.
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