MX records and CNAMEs

[Doug Barton]

Thor Kottelin wrote:
> 
> Will Palmer wrote:
> 
> > The MX records for my domain are currently as follows:
> >
> > domain.com IN MX 0 smtp.domain.com
> > domain.com IN MX 10 relay.domain.com
> >
> > With the following CNAME records pointing the specified mail exchangers to
> > the correct servers
> >
> > smtp.domain.com IN CNAME mail.domain.com
> > relay.domain.com IN CNAME mail2.domain.com
> >
> > Is this ok or could it potentially cause a routing problem.
> 
> RFC 2821 allows it:

However, this RFC is still on the standards track, it hasn't been adopted.
And, even if it gets adopted, you can't do anything about the installed
base of old mail servers that don't properly handle CNAME's.

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