Hello.
Recently, i migrate my Exchange Server to Zimbra, and my migration occour without problems.

When an user send a message to my zimbra server and user no exist at accounts, user receives this error:
recipient address rejected: domain.com
Unable to deliver message to <user@domain.com>

Normally, user receives "User Unknown" or "User unknown in local recipient table".

How can i change this message?

Thanks!
GK