It works since July see this blog post: https://protonmail.com/blog/address-verification-pgp-support/ https://protonmail.com/blog/address-verification-pgp-suppo

It works since July see this blog post: https://protonmail.com/blog/address-verification-pgp-support/ https://protonmail.com/blog/address-verification-pgp-support... I don't know why they announced it now but I've been using it previously.