Welcome to the forums,
Sure, to prevent them from sending mail externally:
Restrict sending to certain domains - Zimbra :: Wiki
One step further - who can send to those accounts/preventing those accounts from getting external mail:
RestrictPostfixRecipients - Zimbra :: Wiki
Be sure to vote for:
Bug 5595 - per-domain send restriction
(& even
Bug 9620 - Mail policies and access control for sending to distribution lists)
Quote:
Make check boxes for:
-User can send email outside of their domain
-User can recieve mail from outside their domain
That is to say we don't want to overlook having a blank to enter what domains they can sent to/receive from (but that's the majority of requests).
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