On 04/11/2017 09:15 PM, Tony Finch wrote:

On 11 Apr 2017, at 20:09, Florian Weimer <fwei...@redhat.com> wrote:

On 04/11/2017 08:42 PM, Tony Finch wrote:

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.

That doesn't work if the web server is at 3rd party provider A but you want 
provider B's mail service not provider A's.

I don't understand.

I think it boils down to who operates the target DNS zone and how flexible they are. It has nothing to do with who runs the web server.

Thanks,
Florian

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