Hi David,
This reply is off-topic and is not related to the current rfc2821-bis
discussion.
At 19:58 01-05-2007, David F. Skoll wrote:
Perhaps an RFC for querying whether or not an e-mail address is
valid using DNS? :-)
host -t txt some.email.AT.example.com.email-verification-zone.example.com
This is an interesting idea. How about:
host -t txt f098474401a124aa5a2738b6353e22da.example.com._vrfy.example.com
where f098474401a124aa5a2738b6353e22da is a MD5 hash of the email
address. That's to avoid disclosing the actual email address.
Queries for the zone can be restricted to the DNS server used by the
secondary MX. It may not scale well for a site with a lot of email
addresses. It should suite the needs of small and medium sites as
they can use their existing DNS infrastructure to implement it.
Regards,
-sm