[unreal37]

You could send mail to the wrong address intentionally. Like you want to send mail to 3 Main Street, but you write "5 Main Street" instead. The person who receives it will say "Ah, this is for Joe. He lives next door!" and hand deliver it.

That's mostly sarcasm. There's no getting around the tracking if you want to use regular USPS mail or Google Gmail. Just go meet in person, and leave your cell phones at home.

[ISL]

Make sure you walk or go by bicycle or public bus, too. Untracked personal communication and conveyance over long distances is hard in the present system.