On Wed, Oct 30, 2024 at 08:57:32PM +0800, Adriel via Postfix-users wrote:

> I have another question. Suppose I have two domains: foo.com and bar.com.
> Both point to an MX server: mx1.sample.com. However, on mx1.sample.com, I
> want to route bar.com's emails to mx2.sample.com, because mx2.sample.com has
> the complete user database for bar.com, and mx2.sample.com is only
> accessible from restricted IP addresses. In mx1.sample.com's postfix
> configuration, I'm using the following settings:
> 
> relay_domains = bar.com
>     transport_maps = inline:{
>     { bar.com = relay:[mx2.sample.com] }}
> 
> Is this configuration correct? Thank you.

Correct, but not complete, it is missing a recipient table for the relay
domain, you need:

    # Real table if more than a handful of users.
    relay_recipient_maps = inline:{
        { [email protected] = exists },
        { moe@[email protected] = exists },
        { [email protected] = exists },
        }

-- 
    Viktor.
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