Get a pencil and paper. You'll want to write this down. Nor would you want there to be one. If such a list existed, every cretin would harvest it and you would be buried in junk. Get ready for this.
Most people send jokes to more than one person at a time.
Usually, when someone receives the joke, they simply forward it to their friends, and so forth, and so on. After a while, these jokes have so many addresses on them, you have to scroll quite a bit just to see the funny story. Many spammers have software that can extract e-mail addresses out of messages. Even if you don't forward jokes to others, if anyone has sent a joke TO YOU, your address becomes public knowledge. They will all still receive the joke, but their addresses will not show up on the messages.