On Fri, 21 Feb 2020 06:00:14 -0600
Tom Browder <tom.browder@gmail.com> wrote:
...
> As I understand it, a mail server has to use smtp to physically
> transfer mail between physical hosts and that requires one name that
> will resolve to an IP. Even if the server is hosting multiple
> domains, the mail for each still has to use the one "mailname" for
> transport.
Not really, you can have an A record for each domain, with the MX
record for each domain pointing to its 'own' A record. The only common
feature must be the IP address that the A records point to.
You may well have only one PTR record for the address, although
multiple PTRs on one address are valid, but not many ISPs make provision
for that.
Interesting--I would prefer that. So with all mail stuff on one server, I can have each domain's MX record point to its own mail server. And I do have control of the PTR record. I just need to ensure everything resolves to the correct host IP.
So how does all that jibe with the single name required by OpenSMPTD?
Thanks, Joe.
-Tom