uni
Jun 07, 2012Altostratus
Cannot create a CNAME for a domain root
My customer has a site to be hosted behind GTMs. The ISP is authoritative for site.example.com. The GTMs are authoritative for wip.example.com. They want the site to be accessible via site.example.com.
Initially, we thought we could just define the alias as
site.example.com CNAME site.wip.example.com
However, site.example.com has MX records:site.example.com MX 10 mail.site.example.com
From what I can tell, this is not allowed, and is stated clearly in RFC2183 10.3:The domain name used as the value of ... or part of
the value of a MX resource record must not be an alias.
although rfc5321 5.1 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 former position is reinforced by the ISP, who state they cannot create a CNAME for a domain root.Can someone suggest a solution to this problem?