18 U.S.C. § 1341 provides:
Whoever, having devised or intending to devise any scheme or artifice to defraud, or for obtaining money or property by means of false or fraudulent pretenses, representations, or promises, or to sell, dispose of, loan, exchange, alter, give away, distribute, supply, or furnish or procure for unlawful use any counterfeit or
spurious coin, obligation, security, or other article, or anything represented to be or intimated or held out to be such counterfeit or spurious article, for the purpose of executing such scheme or artifice or attempting so to do, places in any post office or authorized depository for mail matter, any matter or thing to be sent or delivered by the Postal Service, or deposits or causes to be deposited any matter or thing to be sent or delivered by any private or commercial interstate carrier, or takes or receives therefrom, any such matter or thing, or knowingly causes to be delivered by mail or such carrier according to the direction thereon, or at the place at which it is directed to be delivered by the person to whom it is addressed, any such matter or thing, shall be fined under this title or imprisoned not more than 20 years, or both.
Fun fact, postal office investigators are like the freakin FBI. Through various fun techniques, they can actually identify who posted a letter (sometimes), in what mail box and when.
If you or anyone you know has been a victim of mail fraud, say, from a cryptocurrency project sending snail mail or anything similar to that effect, I would recommend filling this form out
https://ehome.uspis.gov/fcsexternal/default.aspxFrom what I can see from a user on reddit : "My address was in the Ledger leak database and yesterday I received a three page, double-sided letter from Hex (read: Richard Heart), claiming 95,000% gains if you invested in Hex."
If someone has that letter, please scan it and post it or send me a link. Because as an ex-mailman, it makes me feel very bad to deliver these things to people. And I will report it. So should you.