Greetings again.
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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.
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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. Note that
the informative note only says what x= is not. Leaving x= in can also
lead to silly states.
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Changes:
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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