Michael Thomas wrote:
The same reason that you've tirelessly advocated that DK selectors
be backward compatible: that many sites only have a rather tenuous grip
on the manageability of their DNS entries for DKIM.
If the key is cracked having x= in the message will be pointless. Your
only recourse is to withdraw the key from DNS. Perhaps the
administrative burden can be eased by delegating the .domainkey.domain
portion to the mail administrator.
Eliot
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