On Tue, May 30, 2023 at 08:20:20PM +0800, [email protected] wrote:
> > In other words, where is the mail ultimately delivered for users to
> > read it?
>
> I have a primary mx server saying it's mx1.dkinbox.com, where mails are
> stored.
In that case, "load-balancing" makes no sense. You should assign the
secondary MX host a worse (numerically higher) preference. The
secondary should configure the domain in question as a "relay" domain.
relay_domains = example.com
and must have an accurate table of valid recipients:
relay_recipient_maps = ...
> If I add a backup MX server saying it's mx2.dkinbox.com, I just want both
> the mx1 and mx2 load balances the incoming messages, and mx2 forwards
> messages to mx1 then.
There's no good reason to have mail sent to mx2 unless mx1 is down.
--
Viktor.
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