What are messages?
Moodle does not have a internal email system. It does, however, have a simple system for sending messages between course participants - especially between students and instructors.
Moodle messages are messages sent from one individual to another via the Moodle messaging system. In addition, these messages may be forwarded to an individual's school email account under certain circumstances. Moodle messages are text only - no attachments, images or graphics can be included in a message.
Look for the message center link next to your profile icon in the upper-right corner of Moodle when logged in.