postfix smarthost to relay in same domain

[Roger Grosswiler]

>> In an arrangement like this, what would happen if someone sent a mail to
>> a user that was not local to either server (e,g, due to a mistyped
>> username)? It looks like a recipe for a mail loop to me.
>
> yeah, but in domino server mail loop is easily detected - so not an
> issue for me.
>
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If you have set in postfix $mydomain=mydomain.com, postfix searches that
user on the local machine, if this mail is also sent by postfix :-D

set $myhostname correct, and leave #$mydomain, as otherwise postfix thinks
that is the primary mailserver for this domain.

HTH
Roger