Capabilities/block/email list:sendmessage
From MoodleDocs
This allows a user to send messages to other users.
Why?
This capability was created to prevent guest users to send messages to site users.
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Note: You are currently viewing documentation for Moodle 3.10. Up-to-date documentation for the latest stable version of Moodle may be available here: Capabilities/block/email list:sendmessage.