There is no return-receipt feature to this service. The only way you will know for sure is when your inmate thanks you for sending it. Mail takes a couple of days through USPS. Once it arrives in the mail room it is up to the staff to read the letters, review the pictures and determine when they will hand it to the inmates at mail call
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https://www.inmateaid.com/ask-the-inmate/how-will-i-know-when-he-will-get-the-letter-or-postcards#answer
Accepted Answer Date Created: February 16,2016