Google Apps administrators can now create policies specifying who their users can communicate with over email, and administrators can tailor these policies for different groups of users.
For example, school faculty and staff can have unrestricted email access while students have the freedom to send and receive emails within the school community but are protected from unwanted email interactions with outsiders.
Google Apps for Business, Government and Education
US English Only (Next Generation Control Panel)
How to access what's new:
In the administrator control panel, select ‘Advanced tools’ and scroll down to the bottom of the page to see the new option ‘Restrict email delivery’. To restrict email to just within the domain, administrators will still need to add the domain name here.
For more information:
Help Center: http://www.google.com/support/a/bin/answer.py?hl=en&answer=177482
Get these product update alerts by email
Subscribe to the RSS feed of these updates