That is a commonly held falsehood. It is against the law for anything other than postage-paid US mail to be placed in a mailbox. https://about.usps.com/news/st

That is a commonly held falsehood. It is against the law for anything other than postage-paid US mail to be placed in a mailbox. https://about.usps.com/news/state-releases/tx/2010/tx_2010_0909.htm https://about.usps.com/news/state-releases/tx/2010/tx_2010_0...