On 04/11/2017 08:42 PM, Tony Finch wrote:
Paul Wouters <p...@nohats.ca> wrote:
Can you give me an example of deploying ANAME outside the zone APEX that
is not solved by allowing a CNAME to point to a CNAME (which most code I
think already allows anyway)
https://www.ietf.org/mail-archive/web/dnsop/current/msg19909.html
If you have a subdomain that needs to be a mail domain and a web site, you
need an MX pointing at your mail server and address records pointing at
your web server. You can't use a CNAME because they are usually different
servers.
That's not a problem, you can have MX records at the CNAME target.
Also, mail domains cannot in practice be CNAMEs because of the disaster of
RFC 821 / RFC 1122 mail domain canonicalization.
I can see why this is a concern, but does current sendmail still rewrite
the headers? (The envelope recipient is far less problematic.)
Thanks,
Florian
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