In order to avoid having your mail returned from the prison mail room, follow the BOP guidelines. You may be asking?

Why NO STICKERS including for return address?

FCIs and USPs host a large number of actual criminals (unlike J6ers) and stickers may have been used to send drugs.

Why WRITE ON ONLY ONE SIDE OF PAPER?
Inmates do not actually receive your letters. Everything is scanned in black and white.
We suspect that the BOP is using old types of printers/scanners, and it would be too much work to print both sides.

Why NO CARDS?
It is hard to understand that one but possibly it is too hard to add to the scanner as they are a different size and also, they are both sided.

Do not expect to receive a prompt answer from your J6er. J6ers are designed as terrorists and their mail is reviewed in case you and them would be plotting some insurrection – what a sad joke but this is the narrative their follow.

Prisons are a whole different world. Please continue to support J6ers in their time of incarceration. Mail is one of the most important things you can do besides supporting them financially for their appeals or their commissary.