I installed zimbra on ubuntu 10.4 from a documentation. I configuered the hostname, dns as mail.example.com. I installed zimbra and its working perfect.

The only problem is i can send/receive email from/to admin@mail.example.com only not from/to admin@example.com. Can anyone help me how to resolve that issues.

I want to take out the mail part and want to keep only example.com as my domain.