Disable contact sharing between multiple domains.

Disable contact sharing between multiple domains.

Hi,
 
How to disable contact sharing between multiple domains?
 
I have multiple domains under single email account. The problem is all email ids are automatically shared through AddressBook (means a user from domainA can see all email ids of both domainA as well as domainB).
 
So how to stop this type of contact sharing?
 
Thanks