When addressing envelopes for inter-office correspondence always use mail stop codes (MSC) in addition to building names/numbers and room numbers. Names and routing information should be legibly printed to ensure timely and proper delivery.
When using Government Messenger Envelopes (Holey-Joe), the address should be placed on the next unused line. Mark out all previous entries to prevent misrouting. Clearly enter the addressee’s name and enter the mail stop code (MSC) in the box marked “STOP” (see sample 1). Building and room numbers are also encouraged (see sample 2).