In my organisation Windows server 2012 is configured. Domain is also configured. We are using Exchange server 2013. I created an OU with the name Marketing in domain. Also around 30 users are configured in that particular OU(Marketing.) Mail id is also configured for these 30 users. I want the users in this OU to send & receive the mails from the users that are in Marketing OU. These users should not send & receive mails to other users in different OU's.
Also when the outlook is configured for them then in their contacts only users in Marketing Ou should be there. No other mail ids they can see.
Note:- mail is configured for internal purpose only. There is no public IP.
How can I configure the above for the new created users.