Great job and spot on! I know how good it feels to figure out stuff like this. I did this back in 2018. Was useful for sending encrypted emails to an organization with PKI setup. This was before they had other means through either O365 or a separate vault like sharing web app. Since there was no regular communication between this organization, I had no reason to keep it setup. I was employed by the organization and had an internal email.

Sad I cannot enter. Created an account for the next one. Thanks for giving back