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FOSS email providers?
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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I've been using Proton since it first came out and have had no problems with it. I have a paid account because it's worth it to me to not be the product. And for about $5/mo I get encrypted email, calendar, vpn, drive, and password manager (though I primarily only use the first three).
They have a free version that lets you try it out, though with limited features.
The Mail Plus version of the Password Manager doesn't have any option for 2FA unfortunately, only if you pay for unlimited (US$12/mo).