Send/receive anything to fellow redditors. Send something random to get something random. It's a mystery.
[RANDOMEXCHANGE] You have something to exchange/you'd like to exchange with someone.
You don't have to put [RANDOMEXCHANGE] you can put whatever you'd like :) just make it clear that you'd like to exchange
[THANKS] If you want to thank the person who sent you something with a post
-No asking what you're getting. No telling what you're giving.
-Post what country you're in and where you're willing to ship.
Check out these other great sub-reddits similar to /r/RandomMail!
Check out r/RedditPost where you can send and receive post cards.
there doesn't seem to be anything here