Office 365 Cloud Service comes bundled with many features which are focused on Compliance and Security . One of such features is Data Loss Prevention or DLP for short . The focus of this feature is to minimize loss of crucial Data which would otherwise be leaked out by internal people.
Office 365 supports various policies which can ensure that if the outgoing message does not comply with the policies, it would either be a) blocked b) warning message is given but message is not blocked c) message routed to internal auditor before being released .
To know more about DLP , please visit http://www.techgyan.com/Pages/DLP.aspx
with warm regards
Microsoft MVP 2009
Microsoft Worldwide Partner of the Year 2011 & 2007