You can use any email provider in a pretty privacy-friendly way, as long as you sign up anonymously, always use it via Tor, and (most importantly) do gpg locally and just paste ascii. Don’t share your secret key with them/anyone!

• Monero users understandably tend to like Monero-accepting services. Tuta does, albeit indirectly; Proton doesn’t. There is also cyberfear.com, a less known anonymous email provider accepting xmr, but maybe no one is sure if it’s okay.
• Despite all potential issues, for normal users who are still using Gmail etc., Proton/Tuta are still recommended (simply because they’re better than Google).