How can I send a message to all the students on my course ?

To send a message to all students in a Moodle course use a forum. The news forum is provided in all Moodle courses by default, and could be used for this. Make sure that in the forum settings, the option “Force everyone to be subscribed?” is set at “Yes, Forever”. This means that students will receive an e-mail copy of any posts in the forum. You may also wish to change the forum settings so that students can’t post replies. Set “Can a student post to this forum?” to “No discussion, no replies”.  In this way, the forum becomes a one-way channel of communication for staff to give students information. Other fora can of course be set up where students can post replies and create discussions.