[twiss]

We do look up keys automatically using WKD. However, if the non-Proton user's provider doesn't support that, they'll indeed have to attach it or you'd have to import it manually.

We have plans to also look up keys on keys.openpgp.org as well, to offer an automatic solution in case the provider doesn't support WKD.

[ploum]

Thanks for the clarification. I now understand better: I was confusing WKD and keys.openpgp.org as same thing.

As I received the email without the key attached and his domain doesn’t support WKD, I was stuck to manually import from keys directory. It makes sense.