Hello @amcgee2 ...
Assuming that you are an instructor wanting to send all students in your course a message via the Canvas Inbox, you can check out the steps in this Guide: How do I send a message to all course users in the Inbox as an instructor?.
I hope this information will be of help to you, Archie. Let Community members know if you have any further questions about this. Take care...stay safe...be well.
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