> This is a very interesting and valid point! I could actually quite
> easily create MX entries for the host's subdomains on mydomain.org,
> so that MX <hostname>.mydomain.org points to mydomain.org.
>
> But does that mean that in turn, each of these subdomains would need
> to be added as a local domain in exim on mydomain.org? Are there any
> downsides with that? It seems a bit wrong that mydomain.org has local
> domains <hostname>.mydomain.org, but that is just my gut feeling, and
> I may be wrong here?
It's a common configuration for there to be (email) subdomains within a
domain, and also for those subdomains to be handled by the same mail
server (or at least the same MX entry, which is all that the outside
world can tell about the situation).
(We use Exim here and currently our mail server has 144 additional
names on top of its primary name. And notice how common 'local_domains'
(pluralized) is in Exim configurations.)
- cks
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