'Sup 100 Hour Board,
I saw this USPS blue box. It gives a warning about seeing anonymous mail. I'm just wondering, what counts as anonymous mail? Those that are sent without a return address, packages sent without any destination or return address, or is it simply Anonymous mail?
-Fly Like an Eagle
Dear Soaring High,
It seems as though it really is just mail that's supposed to be anonymous. Apparently there are even services to send mail anonymously. My guess is that the sign is specifically referring to mail sent by such services.