Can I have a letter pulled from the USPS Mail Stream?

Yes.  Certified Mail can be pulled from the USPS mail stream after the letter has been mailed.  Use PS Form 1509 to request the interception of a Certified letter sent through the Postal Service before it is delivered. Submit a completed PS Form 1509 and pay the nonrefundable fee at your nearest Post Office. 

However, it is important to understand that there is no guarantee that the item can be intercepted before delivery and that the intercepted mail will be redirected back to the sender’s return address and may incur postage due at the applicable price to be paid upon delivery by the sender.