> Well - note that OP uploaded a key to keys.openpgp.org, and then seemingly forgot about it and lost the private key (or at least they couldn't decrypt encrypted emails, and their email client - not Proton's - showed them as being blank). So it's not a scenario that we explicitly tested for, and not something we can unilaterally fix completely - although we can try to make it clearer for the recipient why the message was encrypted and with what key, of course.
OP claims to have no memory of having gone through the steps in the published draft standard. The steps involved are at least somewhat more rigorous than merely submitting a key and address to a database, so I'm leaning toward believing OP and questioning the database, especially since the project appears only to have been started in 2019 so completely forgetting having ever gone through such a process seems less plausible than questioning the database.
Further suspect may be the standard, itself (hence "draft"). Why it doesn't require a domain to publish a policy per address for the domain or at least publish that the domain approves usage of the policy seems a rather large oversight* given how it can break email, so this still leads me to be suspicious of Proton as draft standards should be considered "beta", and passively be explicit opt-in (no prompts - user must dig somewhere into the settings to enable).
* I've only briefly skimmed it, so maybe I missed the part covering this.
OP claims to have no memory of having gone through the steps in the published draft standard. The steps involved are at least somewhat more rigorous than merely submitting a key and address to a database, so I'm leaning toward believing OP and questioning the database, especially since the project appears only to have been started in 2019 so completely forgetting having ever gone through such a process seems less plausible than questioning the database.
Further suspect may be the standard, itself (hence "draft"). Why it doesn't require a domain to publish a policy per address for the domain or at least publish that the domain approves usage of the policy seems a rather large oversight* given how it can break email, so this still leads me to be suspicious of Proton as draft standards should be considered "beta", and passively be explicit opt-in (no prompts - user must dig somewhere into the settings to enable).
* I've only briefly skimmed it, so maybe I missed the part covering this.