How to setup Luser Relay in Zimbra

Login with zimbra user and run below command

#su - zimbra   (Replace with your domain )

$ zmprov md example.com zimbraMailCatchAllAddress @example.com zimbraMailCatchAllForwardingAddress @example.com zimbraMailTransport smtp:mail1.example.com

Reload Postfix Service

$postfix reload

Now Test Mail.