[bartbutler]

For internal use we had all RSA keys so it was fine. For external use we have to support what everyone uses, and there is a variety as you know. Saying "hey, you can use PGP but all your friends have to have RSA keys" is not a recipe for a good user experience.

[e12e]

This is great to hear! If/when protonmail transitions to be mail host that support open standards in a wider sense, I'd more seriously consider becoming a customer :-)

Fwiw, while I'm not that interested in the current project - I actually think it's great to build a walled garden on open standards - especially for secure services. Makes it easier to evaluate, and opens the door fore secure interop in the future.