A letter from home arriving at mail call is one of the most powerful moments in an incarcerated person's day. It is proof that someone on the outside is thinking about them, that life is continuing, and that there is something worth coming home to. But sending mail to a correctional facility involves rules that vary by institution and mistakes can mean your letter never arrives. This section covers how to address mail correctly for federal and state facilities, what the mailroom screening process looks like and how long it adds to delivery time, what content is and is not permitted in letters, how to send photos and why sending them through InmateAid's service is more reliable than printing and mailing them yourself, how to send mail from outside the United States, and what the InmateAid return letter service does for inmates who want to write back. The guidance here makes sure every letter you send reaches its destination. See also our sections on Inmate Care Packages, Send Books and Magazines, and Inmate Phone Calls.