MX record problems

[ceefus]

I've been having some problems installing Zimbra.. As you may see from the title..

I'm behind 2 routers both with the firewalls turned off. The first router is at: xxx.xxx.1.1

The second is at:
xxx.xxx.2.1

I have ports 21, 25, 110, 80 and ports 8080 forwarded properly to the host machine. I know they're done correctly because my webserver is working.

I have tried installing with the hosts file directed to:
xxx.xxx.1.xxx mail.mydomain.com
xxx.xxx.2.xxx mail.mydomain.com
xxx.xxx.xxx.xxx mail.mydomain.com <- public IP

I can ping my mydomain.com and it resolves to my public IP.

When installing zimbra and it tries to resolve the host.. I re-enter mydomain.com and it lists:

MX: mail.mydomain.com (my public IP)
Interface: xxx.xxx.2.xxx
Interface: 127.0.0.1

What is going wrong with my MX records?? They should be coming to my public IP then forwarded to my local IP right???

Any help would be much appreciated!

[uxbod]

Please post the following so we can validate your DNS setup

cat /etc/hosts
cat /etc/resolv.conf
dig yourdomain.name mx
dig zcsserver.fqdn.com a
host `hostname` <- note backticks and not double quotes