The mail will get forwarded within the Riker's Island Complex
https://www.inmateaid.com/ask-the-inmate/if-i-send-an-inmate-mail-to-amkc-at-rikers-island-and-it-arrives-after-they-have-been-moved-to-emtc-at-rikers-what-are-the-chances-that-they-will-receive-it-will-it-get-returned-to-me-forwarded-to-them-or-simply-thrown-away#answer
Accepted Answer Date Created: June 28,2015