On Wed, 9 Oct 2024, Al Iverson via mailop wrote:
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!
About 10% of the DKIM signed email in my mailboxes
seems to have an x= DKIM tag.
The top two d= tags are 1e100.net and gmail.com
This is by manual grepping, but it does look like I am only counting
DKIM headers with x= and not any other headers with " x=".
--
Andrew C. Aitchison Kendal, UK
and...@aitchison.me.uk
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