@wannenmacherel ...
In addition to what @travis_thurston has already mentioned, I'll also add that Canvas does not have e-mail. It's messaging. The difference is that you can send messages inside of Canvas that go to a user's Canvas Inbox. However, each user can choose the ways that he/she wants to be contacted (e-mail, Twitter, text message, etc.) and then the frequency of those notifications. It is completely possible that if you message someone from within Canvas that that person may have e-mail notifications turned off...and only receives notifications via text message (for example). So, if you truly want to ensure that you are contacting your students via e-mail, I would recommend that you get an e-mail list of your students and then send the message through your school's e-mail client (Outlook, for example). Here are some Canvas Guides for you on notification preferences:
How do I add contact methods to receive Canvas notifications?
How do I add an additional email address as a contact method in Canvas?
How do I add a text (SMS) contact method in Canvas?
How do I set my Canvas notification preferences?
Hope this helps, Elizabeth!
