On Wed, May 27, 2015 at 5:36 PM, Bryan Fields Bryan@bryanfields.net wrote:
(Please trim inclusions from previous messages) _______________________________________________ On 5/27/15 8:33 PM, Don Fanning wrote:
(Please trim inclusions from previous messages)
RFC5321 in Section 5 [http://tools.ietf.org/html/rfc5321#section-5
]
states:
"The lookup first attempts to locate an MX record associated with
the
name. If
a CNAME record is found, the resulting name is processed as if it were the initial name.*"*
This means if the lookup for www.example.com. returns CNAME
example.com,
it will use the MX records under example.com., not anything under the
CNAME
record www.example.com.
That is not true at all. The previous paragraph states that it must process the entire FQDN and not many any inferences as to the domain's relationship with the FQDN.
I'd like to try it out then, as I'm certain this doesn't work that way in most resolvers for MX's. I've run into it before even.
I can tell you that GMail's MX RR's work in this fashion. I don't need to know their A record for my DNS. I just add their CNAME'ed MX records to my domain files and my mail shows up. And my domain isn't hosted by them. Just my mail hosting.