Adriel via Postfix-users:
> I would like to set up two MX servers with equal priority, both using 
> Postfix as the MTA software. One MX server resides on the same physical 
> machine as the Dovecot service, and I am familiar with their 
> configuration. However, the other MX server is located in a remote data 
> center separate from Dovecot. Could you advise on how to properly 
> configure these two MX servers to ensure they work correctly together?

In the text below, local MX is the MX that is closest to Doovecot,
and remote MX is the other one.

If the remote MX host can reach the Dovecot server directly, configure
it to do that.

Otherwise, make the remote MX host a secondary MX:

- With DNS, specify a larger MX preference than for the local MX server), 

- With Postfix, list the domain in main.cf:relay_domains, with the list of
valid recipients in main.cf:relay_rercipient_maps. 

Some example is at
https://www.postfix.org/STANDARD_CONFIGURATION_README.html#backup

        Wietse
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