Zimbra Change Domain Name Email Server. In the Outgoing Server Tab select My outgoing server SMTP requires authentication. The installation menu shows you the default configuration values.
This is the MTA authentication server host name and is set to one of the Zimbra mailbox servers hostname. You can change any of the values. Make sure the DNS records MX records too are changed beforehand to reflect the new domain and to match the IP of.
There are 2 ways to do this.
The general domain configuration does not change. The installation menu shows you the default configuration values. Whether full backup snapshot of VM or rsync the optzimbra. Click on the Advanced Tab.