This sounds like something that could be similar to an issue we had in the past.
Masquerade as a user (student or faculty) who reports that they didn't receive an email notification that they should have and look at their Ways to Contact email address(es) in their user settings. If there's a yellow triangle with a black exclamation mark within next to it/them
, there's a good chance Instructure (amazon web services, actually) has that Canvas users email address currently under suppression/black listed after an episode of bounced email going back to Instructure/AWS. If you see one, a yellow triangle
, check in with a few more of your Canvas user accounts reporting the same issue to confirm (masquerade as them and check ways to contact email addresses for the triangle), and then reach out to instructure/your CSM and ask if you can have a list of suppressed user emails in your Canvas instance. Share that list with your IT department and ask if any email service/system maintenance, events, or the like could have happened in the recent past that would cause email to bounce back to to Instructure/AWS, etc. etc.
Odds are there will be nothing either side can do but wait 2 weeks for the suppression to stop... but, you'll know what's happening anyway. Users adding a personal, or ultimately another email address to their ways to contact is a work around until the two weeks pass.
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