So basically you have for some reason set your server's FQDN to hostname.example.tld, but you want all access to the server to be via mail.example.tld?
Just leave everything the way it is, and in DNS set the A record for mail.example.tld to the same IP address. You might also want to set a virtual host on the zimbra server to mail.example.tld.
Zimbra doesn't really care what hostname people use to access the server, the only part where it matters is the login screen where if users are not accessing via the FQDN they would need to enter their account name as "account@example.tld", however if you set a virtual host on the users domain to the address they are accessing the server by, then the server will know to add the "@example.tld" part for them. |