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'. _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf