Russell King <rmk+exim@???> wrote:
>
>My problem with IP literals is that (eg) postmaster@[myrelaymtaip] doesn't
>exist in the first place. Note: I'm not saying that postmaster@mydomain
>does not exist; it most certainly does. However, because the externally
>reachable MTA purely provides filtering and routing with _zero_ local
>users, it doesn't have a postmaster address of its own. It doesn't
>even have any local domains as such. (It has a fixed set of domains
>which it does relay for, and that's all.)
Note that if Exim receives a message sent to <postmaster> (unqualified) it
will use qualify_domain to turn it into a full email address. This address
must work, and in fact it's hard to break it and still have working
cron email etc. Once you notice this, it's easy to add a simple router
to support postmaster-only machine-specific domains in the same way.
postmaster:
driver = redirect
domains = @ : @[]
local_parts = postmaster
data = postmaster@${qualify_domain}
Note that multi-homed machines, or machines whose reverse DNS differs from
their primary hostname, should have all their aliases in the domain list.
Tony.
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