Mail server in which users can only mail each other

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I have a small community server and some users and I were chatting about email servers. We had some ideas about letting some younger users have accounts, but someone said that we would have to block incoming and outgoing email that wasn't from or to our own users.
Is there any way to do this? Users would need to have the ability to email each other.

Dittoslash

Posted 2015-05-17T08:13:41.483

Reputation: 83

No answers