Of possible interest to this WG, or to the members of this WG, is
draft-moore-smtp-addrquery-01
Basically this is an extension to SMTP to allow mail exchangers to be
queried for information about the email addresses for which they accept
mail.
Such information could include public keys.
TLS is required by this extension and is used to authenticate the responses.
Chris (my co-author) and I would appreciate feedback on this.
https://tools.ietf.org/html/draft-moore-email-addrquery-01
Keith
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