[dns-operations] Can MX be working with CNAME?

Tony Finch dot at dotat.at
Mon Oct 21 15:16:56 UTC 2013

Jo Rhett <jrhett at netconsonance.com> wrote:

> Tony, you seem to be confused about how dns and mail work. Fallback to
> host deliver when an MX doesn't exist was poor behavior in the original
> RFC, and has been fully deprecated behavior for more than 20 years now.

You might like to review section 5 of RFC 2821 and RFC 5321, and if you
have the time you could read the discussions of this feature in the
ietf-smtp mailing list archives.

f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Forties, Cromarty: East, veering southeast, 4 or 5, occasionally 6 at
first. Rough, becoming slight or moderate. Showers, rain at first.
Moderate or good, occasionally poor at first.

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