You may do so with InmateAid. All of the correspondence coming from you through us has the InmateAid return address and not the sender's. If the inmate wants to write you back, they may do so through us as well. We receive and post their letter to your account and notify you via email of it's arrival.
https://www.inmateaid.com/ask-the-inmate/i-want-to-send-letters-and-money-but-i-dont-want-the-inmate-to-know-my-address#answer
Accepted Answer Date Created: June 08,2015