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/i-sent-my-son-a-letter-via-the-web-how-will-i-know-if-he-gets-it#answer
Accepted Answer Date Created: April 24,2013