Ah that is slightly different. TDCJ inmates can only mail property to individuals on their visit list, so if the inmate works in the craft shop, or wants to send art boards to the outside world, it must go to someone on their visit list - visitors can also collect items from the unit when they visit.
But inmates can receive letters from anyone, and can send mail to anyone that is not on thier negative mailing list (eg victims, minors etc).