Hot take: stop falling for Protonmail and Tutanota's lies about the existence of “safe e-mails”.
Encrypting the payload of the email isn't worth it, most surveillance programs doesn't need to see it anyway to draw conclusions, since metadatas are always in plaintext.
(For example: if you receive mail from your doctor, and then you send an email to some cancer scan institute, I pretty much can guess what happened without the content)
They also can be compromised very easily, since you rely on the webmail/app, what prevent them to middle-man the pgp-encrypted mail you received ? You're safer with a trusted browser extension / mail client encrypting the payload yourself...
In addition, Protonmail is lock-in: they don't offer any auto-forwarding ability, voluntary remove Sieve Filter's ability to forward email.
I don't know for Tutanota, I hope they play nicer.
Weh, sorry, saw an ad again for them needed to vent (and I'm locked on proton it's frustrating)