Mate of mine used to have conversations with the postman on postcards that while while they were addressed to us ALL the text was directed towards the postman.
It's been over 30 years. But they'd read something like;
"Hi Mr.Postman, hope you're having a good day. The weather here is quite lovely. I've been drinking quite a bit. How's your rounds going? Hope it hasn't been raining too bad? Have you broken in the new boots yet? I hear you're getting new bicycles?"
Then the answers would be written in tiny writing in between the questions.
Since Ireland got what we're calling eircodes (post codes for Ireland) we can now have a house level address in 7 chars. So mine is Xxx XXxx I really must try and send myself something with JUST that on the label?! With a wee apology on the back for taking the piss.