The securemail addon was overwriting all of the user settings form rendered before it. I've added a concatenation operator to ensure we're not losing any content on this page.
Secure Mail
Send notification mails to user encrypted with GPG. Each user can enable it and submit his public key under Settings-> Addon -> "Secure Mail" Settings.
Use 'openpgp-php' library, a pure PHP implementation of GPG/PGP. See project repo.
Need Friendica version > 3.3.2 to work.