A reader forwarded what he briefly imagined might be a bold, if potentially costly, innovation on the old Nigerian prince scam that asks for help squirreling away millions in unclaimed fortune: It was sent via the U.S. Postal Service, with a postmarked stamp and everything.

In truth these old fashioned “advance fee” or “419” scams predate email and have circulated via postal mail in various forms and countries over the years.

The recent one pictured below asks for help in laundering some $11.6 million from an important dead person that anyway has access to a secret stash of cash. Any suckers who bite are strung along for weeks while imaginary extortionists or crooked employees at these bureaucratic institutions demand licenses, bribes or other payments before disbursing any funds. Those funds never arrive, no matter how much money the sucker gives up.

It’s easy to laugh at this letter, because it’s sometimes funny when scammers try so hard. But then again, maybe the joke’s on us because sending these scams via USPS makes them even more appealing to the people most vulnerable: Older individuals with access to cash but maybe not all their marbles.

Sure, the lure costs $.55 up front. But a handful of successful responses to thousands of mailers could net fortunes for these guys phishing it old school.

The losses from these types of scams are sometimes hard to track because so many go unreported. But they are often perpetrated by the same people involved in romance scams online and in so-called ‘business email compromise” or BEC fraud, wherein the scammers try to spoof the boss at a major company in a bid to get wire payment for an “urgent” (read: fraudulent) invoice.

These scam letters are sometimes called 419 scams in reference to the penal code for dealing with such crimes in Nigeria, a perennial source of 419 letter schemes. A recent bust of a Nigerian gang targeted by the FBI gives some perspective on the money-making abilities of a $10 million ring that was running these scams all day long.

Reportedly, in the first seven months of 2019 alone the FBI received nearly 14,000 complaints reporting BEC scams with a total loss of around $1.1 billion—a figure that nearly matches losses reported for all of 2018.