Dnia 14.10.2020 o godz. 17:03:05 Jason Long pisze:
> Thus with "https://wiki.centos.org/HowTos/postfix"; tutorial I'm on a right
> track and Postfix doen't have any specific options about the selecting
> record? The Postfix server configured properly and the record option is
> not related to it?

Mail server (Postfix) and DNS (domain name server, where you define A and/or
MX records) are two completely different services, although they need to be
coordinated in order to get mail delivered to your mail server.

You found a tutorial on Postfix, take another step and find a tutorial on
configuring DNS service.
You can start for example with this one - it's the first one I found when
searching for "DNS configuration", although I don't guarantee it's the best
one:

https://www.wired.com/2010/02/set_up_a_dns_name_server/
-- 
Regards,
   Jaroslaw Rafa
   r...@rafa.eu.org
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."

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