In the event that Canvas is not available, you can use Self-Service Banner to see your class roster and e-mail them directly from Banner. The e-mail messages are sent directly to their MSU Denver school e-mails, circumventing the usual Canvas messaging system that we normally rely on.
Please see this video tutorial created by Garrett Chism for more details and a walkthrough on how to access your roster in this manner:
https://msudenver.yuja.com/V/Video?v=16104585&node=68767531&a=138514981