How to Change hostname on zimbra

Step: 1

To stop zimbra all services.

#su zimbra
#zmcontrol stop

Step: 2

To execute the below commands with new hostname

#/opt/zimbra/libexec/zmsetservername -n newhostname (mail.server.lan)

Step: 3

Then start the zimbra service.

#zmcontrol start

REF:
https://dilliganesh.wordpress.com/category/zimbra/