Can the inmate write back to u on here

Yes, they use the InmateAid office address - the mail comes in and is scanned and placed into your My Account Dashboard. This serves to protect the user on several fronts. If you mail into the prison/jail with a return address, and you want your inmate to know your address, it's best to put it in the body of the letter and not the return address. Other inmates use that sort of detail to extort, blackmail or otherwise menace good folks on the outside. The other reason is to keep your whereabouts private until you are sure you want the inmate to know it. A lot more people than you'd think use this to remain somewhat private from the prying eyes inside.