Uh, what situations are those? If DKIM isn't useful for mail sent to
humans with MUAs, why are we wasting our time?
A nice strawman.
No, it's an honest question. Many real users read their mail a whole lot
less often than we weenies do. I know people who read their mail once a
week.
If your issue is that the time was a week, change the x= time to 15
minutes, the mail still lands in the recipient's mailbox in 10 seconds,
and the user reads mail once an hour. Same problem.
Then you're not giving x= a value that is in line with the spec either.
DKIM is intended to work over the normal transport lifetime of a mail
message.
Now we're back to the original question. How do you as a sender know what
is normal in my inbound mail system? You don't.
Conversely, if senders are always supposed to set x= to t+1209600, what is
the point of x= ? It contains no useful information. Even worse, since
there is no reason to assume that a sender will set an x= that is
appropriate for a receiver's situation, it is likely to contain
disinformation that a sensible receiver should ignore.
R's,
John
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