At 00:57 26-03-2008, Mark Andrews wrote: > Which is not documented in any RFC despite being a good idea. > > It is easy to turn "MX 0 ." into "This domain doesn't support > email" as "." is not confusable with a hostname. There is no > reason to look up addresses records for "." There was an I-D, draft-delany-nullmx-00, which didn't make it to RFC status. > Which could just be a misconfiguration. You still have to > look up addresses for "dev.null". Yes. People still do it. > > If the implicit MX rule is depreciated for IPv6, the above won't be needed. > > It's still needed to prevent the A lookup. It would be needed until IPv6 takes over. Regards, -sm _______________________________________________ IETF mailing list IETF@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf