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I knew an inmate in Pennsylvania, the prison system there stopped accepting physical mail if you wanted to write an inmate, you sent a letter to a company in Florida. While their name was also in the address, the letter was to "Smart communications," in a state where you knew they were not located. That's probably the excuse they'd use -- the actual mail is not being sent to the addressee.

(In Florida, the letter was opened and scanned, then transmitted to the prison, where it was printed and delivered. It was always unclear whether it was read and reviewed in Florida or Pennsylvania or both.)