I set up ''multiple Gmail accounts on TB'', and all work as expected. I have turned off Win 11 telemetry and I use an always-on, kill-switch VPN. On TB, each of the outgoing SMPT servers is set to a different Gmail account. Keeping in mind the settings, above: can Google determine somehow, through TB keys/OAUTH/data/settings etc., that the user of '''one''' Gmail account is the '''same''' user of another Gmail account? Also, I can post this question to the separate Android blog, but if anyone here knows the answer to the same question with K-9 (F-droid version), I'd appreciate it.