Al Iverson via mailop:
I love the idea of the X tag with DKIM to set an expiration date after
which the signature should no longer be considered valid. (As
described here, and many other places: https://xnnd.com/dqio ). But
who actually has implemented this, if anyone? Are you aware of any
ISPs, ESPs, automation platforms, anyone, who has done so? I'm not
finding much.
If you've got any evidence of x= in the wild that you care to share,
thank you kindly in advance!
Hi,
I'm using OpenDKIM's SignatureTTL [1] since years with no notable impact.
(For my private domains and in $dayjob's not so small mailsystem)
Andreas
[1]
https://manpages.debian.org/bookworm/opendkim/opendkim.conf.5.en.html#SignatureTTL
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