[hangsi]

This reminds me of a classic (non-internet powered) version of this where every business in London was sent to some unsupecting resident's address in order to win a bet, clogging the streets in the process: The Berners Street Hoax of 1810.

https://en.wikipedia.org/wiki/Berners_Street_hoax

[ekimekim]

What I love about this is that it's a textbook example of a reflection DoS attack (https://en.wikipedia.org/wiki/Denial-of-service_attack#Refle...) - you send a message with a spoofed reply-to address, such that the message you sent (in this case, a letter) is much cheaper than the response eventually sent to the victim (in this case, tradespeople / goods / dignitaries).

[googlryas]

Just to point out some possibly ambiguous phrasing, but the person pulling the prank was trying to win the bet - the tradespeople and visitors were called there to use their services(ie chimney sweeps thought they were going to sweep a chimney), not that they themselves were going to claim some prize.