At 19:12 -0400 on 04/09/2008, John C Klensin wrote about Re: What is
the history of 2821 and implict MX?:
--On Wednesday, 09 April, 2008 17:21 -0400 "Robert A. Rosenberg"
At 14:29 -0500 on 04/08/2008, Pete Resnick wrote about Re:
What is the history of 2821 and implict MX?:
The MX rule of 974 is perfectly reasonable to apply to IPv4
RFC 974 also requires the use of a WKS record to verify that
the IPN address has a MTA running on it.
Please read RFC 1123 (section numbers mentioned in an earlier
note). Use of WKS was explicitly deprecated; the MX rule was
I am aware of RFC 1123 and you are quoting me (and referencing RFC
1123) out of context since that statement was immediately followed by
"Since we do not use WKS records for this purpose ..." thus
indicating (but not explicitly mentioning RFC 1123 as the reason) I
was aware of the WKS deprecation (although it might have been better
to have said "no longer" not "do not").