In my company we are using windows server 2012 configured with domain. Also Exchange 2013 configured. Now my management wants the following:-
1 :- Only some users can send & receive mails to some users only. Ex:- A & B can send & receive mails from C & D only. No other users can send them & they can't send to any other users apart from the mentioned.
2 :- Also in their Address Book they can only see the mail ids of those users only to whom they are sending & receiving mails from.
Note :- users belongs to different OU's.
Please suggest me how to solve it.