Just wanted to add a note to the great tips from my buddy Chris here (+5).
You could also use CUDD the Connection User Data Dump tool from the great Unity tools site to accomplish this query as this is one of the available outputs ;
- Message Action Settings. Outputs all 4 message action settings and the email relay address configured for the user. The message actions include a number describing what Connection will do with inbound email, faxes, voice mail and receipts for a user. The actions are as follows: 0=reject the message, 1=accept the message, 2=relay the message to the relay address or 3=accept and relay a copy of the message to the relay address.