MH Michael Hammer (5304):
Focusing on subdomains, I believe it may be useful for both senders and
checking receivers if a domain were to be able to assert whether it's
policy applies to all of it's subdomains. Given that we don't know how
receivers or reputation services might utilize such an assertion, I
would avoid must or should for a check at this stage.
How would a receiver discover the top-level domain given example.com,
example.ac.uk, example.org.au, etc.?
Wietse
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