I have a customer who would like to configure the Postfix server he uses such that certain users can only send to local users. I'm wondering if there are any built-in facilities for restricting which delivery agents can be used by particular users? (Or some other clever way of achieving the same end result.) I realize security measures would also need to be taken to lock down the machine from which the mail is being sent, but that's not my problem ;)
Thanks, Patrick
