We would call the facility and ask to speak with the mail room supervisor to find out why.
https://www.inmateaid.com/ask-the-inmate/my-fiance-is-currently-in-montana-state-prison-and-i-have-been-writing-but-they-have-not-given-him-my-letters-he-has-told-me-in-his-letters-and-over-the-phone-he-hasn-39-t-received-any-how-can-i-find-out-why-they-aren-39-t-giving-him-my-letters#answer
Accepted Answer Date Created: May 17,2019