Sam Varshavchik <mr...@courier-mta.com> writes:

> The hostname attribute is read and used by Courier-IMAP

Ah.  Somehow I got confused and was getting the impression that some
Windows component or another was using the field to decide where to
find the IMAP service.  Obviously, if it's Courier that's looking at
the field, then of course it would be an internet-style hostname.

> On the other hand, if your DNS servers are Windows servers, 

That's a whole other can of worms.  (Did I mention that Active
Directory is weird and a pain to deal with?)

Generally, all the computers on the Active Directory domain must use
as their primary name resolver a server that thinks it is
authoritative for the domain and that accepts updates from other
computers in a way that would be insecure for an actual authoritative
nameserver to do.  This is almost always a Windows server, although
BIND is also capable of being configured this way.  If you do not
provide such a nameserver beforehand, the first Domain Controller you
install becomes one, so that's a common setup.  Usually you handle the
resulting security issue by implementing a firewall to the effect that
only computers on the AD domain can access said name service at all,
and you tell the rest of the world that some other, more sanely
configured name server is authoritative for your domain, probably one
that doesn't do recursive resolution at all, *certainly* one that
doesn't accept updates willy-nilly from just any computer on the
network.

Fortunately, all of that should be more or less invisible to Courier.
As long as it gets the right answer when it does the name lookup, the
details of where the answer comes from shouldn't really matter.

-- 
Nathan Eady
Galion Public Library

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