It seems like the most secure way to send a message these days might be snail mail. While I know the feds to open it from time to time in specific cases, they definitely don't open all.
no, they don't open the mail, but they scan all the addresses as part of their routing process. We should assume that all postal "metadata" is stored forever.
There is a lot to be said for Snail Mail in that regard. There are far more privacy guarantees (i.e. clearly defined requirements for warrants, and stricter terms) relative to electronic forms of communications.
I did a fun experiment once. I wrote the actual recipient address in the return address place, and put a non existant address in the front. I also didn't stamp it. It did arrive to the recipient 2 weeks later, with a "return to sender" banner.
Working in the mailing business and dealing with the USPS carriers; they are not dummies (the usual people warning here) and if someone gets curious on why so many pieces arrive at a certain address w/o postage, I would expect that address to get flagged for a special looksee.
