No, you must send the inmate money so that they can purchase envelopes and stamps at the commissary. Most facilities already provide envelopes, paper and pen/pencils. The inmates buy the postage.
https://www.inmateaid.com/ask-the-inmate/can-you-send-envelopes-and-stamps-for-their-inmate#answer
Accepted Answer Date Created: April 11,2016