You will only know that your inmate has received your letter when they tell you by telephone or by return letter. There is no verification process. Prisons consider mail a sacred item that represents a connection to the outside world. Prisons are sensitive to an inmate’s rehabilitation and as such feel strongly that correspondence is critical to that end. We have a strict policy, in the event that a letter gets returned to us, we effort to locate that inmate's status then notify you of its return and let you know the date of the re-mail. If we cannot deliver it, we will refund your money.
https://www.inmateaid.com/ask-the-inmate/how-can-you-know-when-the-inmate-receives-your-letter#answer
Accepted Answer Date Created: May 05,2013