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Hi! PGP is open source, and therefore Proton Mail's encryption is interoperable with anyone who uses PGP to encrypt their emails: https://proton.me/blog/what-is-pgp-encryption. Proton Mail also allows you to send password-protected emails to anyone: https://proton.me/support/open-password-protected-emails.

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PGP is its own protocol though, right? Meaning it is an optional addition to email and not part of the email spec at all?

I guess I fail to see the relevance between the distinction.

If you want end to end encryption, both ends can just run their own email servers.

Yes, but all emails exchanged between two Proton accounts, as well as between a Proton account and a non-Proton user who relies on PGP encryption, are protected by PGP.

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