Capabilities/block/email list:editsettings
From MoodleDocs
This allows a user to edit their eMail settings.
Why?
This capability was created to prevent guest users to edit their settings.
Note: You are currently viewing documentation for Moodle 3.1. Up-to-date documentation for the latest stable version of Moodle is probably available here: Capabilities/block/email list:editsettings.