Jason Long:
> Thank you Kris.
> 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?
Here's some email basics.
1) You arrange for an MX and/or A record in your DNS zone. You edit
the zone file yourself, or you use some provider's application to
edit their zone file.
exammple.com 10 IN MX mail.example.com.
mail.example.com. IN A 10.0.0.2
2) SMTP uses destination port 25 for MTA-to-MTA traffic, therefore
the port information is not in the DNS.
3) Some remote MTA looks up your MX and/or A record and connects to
your Postfix servers on port 25.
Wietse
>
> On Wednesday, October 14, 2020, 06:18:49 PM GMT+3:30, Kris Deugau
> <kdeu...@vianet.ca> wrote:
>
> Jason Long wrote:
> > Thank you.
> > Can you tell me how can I setup my Postfix server with A record
>
> You just add an A record with a suitable name for your server.? There's
> nothing Postfix-specific about this.
>
> > Or how can I change the DNS server two support two MX records?
>
> I'm not aware of any DNS server software that limits the number of MX
>
> records.
>
> I *have* met all too many DNS management tools that make bad assumptions
> about things like this.
>
> You should talk to your IT support and/or hosting provider, because both
> of these are specific to however your DNS records are managed, and
> neither has anything to do with Postfix configuration.
>
> -kgd
>
