Zimbra - restrict certain users to send email only to one specific email address
I need to find out the following for a Client who is using Zimbra, i do know how to restrict sending to specific domains or such, but his requirement was the following.
They would like to restrict some users (some of their stores email accounts) to send email to any address, these users should only be able to send email to one specific address.
Is there any way to do this?
Any Help would be appreciated.