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Two factor authentication seems widespread. Even my ISP (a classic late adopter) supports it. I think you've been assuming you need a email provider that supports PGP or some other way to securely store mail to get it (because they're the ones marketing themselves as a more secure solution).
The main issues seem to be what type of 2FA do they support and does it also support email clients (you might not care about the latter). I use Fastmail as my main email provider and they support multiple methods of 2FA (authenticator app, code sent via SMS or using a U2F/FIDO key like Yubikey), but not for email clients.
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