I've spent the last hour digging through the forums and haven't gotten anywhere, probably because I'm searching on the wrong terms, so I decided to just be a newbie and ask directly in the forum.
Here's my setup. Please note that all servers are on public IPs, so there's no NAT going on here.
I have a domain setup on a Plesk server, which has been handling all domain services, including dns, mail, web, etc. Let's say that the IP for the domain, including the mx record, the domain name, etc is 192.168.1.10 (note, it is ACTUALLY on a public IP).
Now, I want to setup Zimbra as the mail server for the domain, but I want to keep all other services, including the primary domain.com name at 192.168.1.10.
I point zimbra.domain.com at the new IP (call it 192.168.5.10) in dns.
Since I can't seem to install zimbra without an mx record, I also setup the mx record for zimbra.domain.com to point to zimbra.domain.com.
Installation works fine.
I setup user accounts under the zimbra.domain.com hostname.
I go back to my plesk server and point the primary MX record for domain.com to zimbra.domain.com.
I can send email to email@example.com, but I cannot send email to firstname.lastname@example.org.
What am I missing?
Thanks for answering my lame question.