Thank you for your long answer. Even if it doesn’t contain the answer I looking for.

nd even if your mixmaster or tor traffic is really anonymized (which is dubious), the fact you are using such services at all probably flags you for attention.

I think so, too. But in my imagination, one who uses tor or a remailer is just a short flash on the radar. If it doesn’t follow more, they would not investigate further. Since 90% or so of all tor users doesn’t do anything bad. Even agencies doesn’t like wasting of time and resources.

If you just want to exchange email with your friend when you are both on the down low, you might be best off just both enrolling gmail accounts.

With Google, I think, it will nearly 100% sure that it is tracked somehow. If both sides have no problem with this, its fine.

Plus, a lot of attention in the crypto nerd world shifted over to things like bitcoin.

Never considered this angle. Thanks for this.

I have heard there was a recent development in single server PIR (private information retrieval).

I remember, I have read, over 5 years ago, a PDF-File from a German university about this. It was a so called “blinded read”-method.

I have a vagly idea how this can work but I lack the mathematical knowleade to explain it further.