While we are on the subject of SRV, port numbers etc:
Why not define SRV prefixes for POP3, IMAP4 and SUBMIT so that email
applications can auto-configure from the email address alone.
I recognize that this would be much more satisfactory with better DNS
security. But even without DNSSEC it would make network management a lot
more flexible and make it much harder for attackers to bamboozle end
users into compromizing themselves with bogus administrative messages
'redirect your email client to use this bogo-server'.
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