Ability to use keybase.io keys for PGP mail
Many people have keybase.io accounts and already use those keys for encrypted mail. It would be lovely to have a feature that allows you to pull in those keys for sending encrypted mail through Protonmail.
Using DNS based lookup (PKA) is being depracated in GnuPG: https://lists.gnupg.org/pipermail/gnupg-users/2018-October/061034.html
But there is an easy to deploy and modern alternative - Web Key Directory, it is decentralized (unlike keybase.io), encrypted (unlike DNS records), easy to deploy (only HTTPS necessary, no exotic DNS records), supported by many applications out of the box (GnuPG, Enigmail, Mailpile) and several providers (posteo.de, kernel.org, gentoo.org). More at https://wiki.gnupg.org/WKD
Mr. T commented
I've been using Protonmail for over 2 years and have been waiting for PGP/GPG integration since I first opened an account. I would be happy to PAY for this feature if it could be implemented in Protonmail
Better to use DNS + DNSSec to publish and retrieve public keys corresponding to a recipient e-mail address. This method will be independent from specific directories.
Kim Nilsson commented
Using external keys, no matter if on keybase or not, would be a definite boost to usability.
Benjamin Lupton commented
This would be great! It seems however that protonmail is making less progress on this, as v3 of protonmail does away with their facebook pgp support. https://protonmail.com/support/knowledge-base/using-protonmail-with-facebook-pgp/ is no longer there in v3
They do have a support page for this at https://protonmail.com/support/knowledge-base/sending-a-message-using-pgppgp/