Quote:
Originally Posted by carlsanders 
So, while external users are reaching my zimbra server via an external IP,
the domain name is the same as my internal users: zimbra.domain.com
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This is what I've got going on myself; I have two sets of DNS servers -- a public master/slave set that does DNS for my domain and my internal (LAN) domain controllers doing DNS via Windows' Active Directory DNS component. I have the same entry (zim.sub.domain.edu as an A entry, opposed to CNAME in your setup) in both internal and public DNS servers, but with different IPs depending on which record people will need (i.e., LAN users don't need my FW's NAT'd address for the zimbra box and internet users can't route to the zimbra box's "real" 172.16.x.x address).
Perhaps I should setup zim.sub.domain.edu as it's own domain so that I can create MX records? I can't create MX records for it in my sub.domain.edu domain since this will break my sub.domain.edu mail.