And a few years before that to 1840, people used to perform similar tricks with mail. Prior to the introduction of postage stamps mail was paid on delivery¹, s

And a few years before that to 1840, people used to perform similar tricks with mail. Prior to the introduction of postage stamps mail was paid on delivery¹, so you could send messages to friends or flood enemies with someone else picking up the cost. There is no new thing under the sun. [/me holds breath for someone to point out an earlier version.] ¹ https://rmspecialstamps.com/about/history-of-stamps/ https://rmspecialstamps.com/about/history-of-stamps/