Why was my letter sent back to me as "returned to sender" when all my other mail has gone thru?
I have been writing to my girlfriend in jail for almost two months now with no issue whatsoever and then suddenly today (5/7) I received one of the letters back with the red stamp from the Post Office "Returned to Sender". The letter which I had received back was post marked 4/30, so I am not sure what happened exactly. She hasn't moved facilities and I called the jail to make sure she is there, and I have the right postage on the envelope so does anyone know what might have caused this to happen? I have seriously mailed countless letters without a problem prior to this and then suddenly I got one back today. I guess my greatest fear is that suddenly my mail is going to have issues going through for whatever reason so I want to ask if anyone has ever had an issue like this? Any suggestions why out of nowhere I had one of my letters returned?
I should clarify also, no mail that was mailed after 4/30 has been returned.