IIRC ProtonMail doesn't need a phone number or recovery email to open an account. Might be what you need

protonmail mail is very good, but if you plan to break a federal law, protonmail will give your emails and date to the feds. The more private email is tutanota, however, it is harder to use.
You can set up a free account on either one. Tutanota also has an ugly, but easy calendar that you can use to send reminders to you. For about 2 months I used it - until I got Nextcloud and synced that with a calendar. I think you can use gpg to encrypt an attached file to send in an email, too. I recently tested it out a tiny bit - not enough, though. I am not recommending gpg, though, as I am not sure it is the best kind. it was quick and easy for me on Linux and that was the ONLY reason I chose gpg encryption. I don't think I needed a phone number for tutanota or protonmail. Another option for less private things is the Russian-based Google-like alternative called yandex. I needed no phone number (just select SKIP) to get an email, it comes with 10GB of drive/disk space, is free. But, because they allow you to use their version of Microsoft Suite, I'd guess they have a close relationship with the USA, so I wouldn't advice using it for anything extremely private. It still is better than gmail, in my opinion, and you may be able to use it just once as a disposable account. You can use Talkatone for free phone calls, but it doesn't work very well sometimes. I needed an email account. I may've used yandex for that. idk.