I want to distribute Avon catalogues into mail boxes, but I heard somewhere years ago that it's illegal to put anything into a mailbox that hasn't been through the USPS. Is that right? (The USPS website only spoke of mail interference and I haven't found this issue addressed anywhere.)
Is it illegal to place anything (letters, etc) into a home mailbox? Where can I find out for sure?
Thanks much for any help.


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