The Pony Express delivered messages, sort of like email, but transmitted with ponies! Or Twitter on four legs! When a post was delivered, there would be “postmark” put on the mail, showing it had gotten to where it was intended to go.
Design a postmark stamp for the Pony Express of the Modern Age.
![By Pony Express Company, 1860 [Public domain], via Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Postmarks_Pony_Express.jpg)
By Pony Express Company, 1860 [Public domain], via Wikimedia Commons
See some examples for inspiration: https://commons.wikimedia.org/wiki/File:Postmarks_Pony_Express.jpg
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