32834217_as___Arts___Sciences_Computing__What_you_need_to_know
[Why it matters] You can communicate with your students — collectively or individually — through Canvas. By default, the email address for all Canvas users is set to the address as listed in the Penn directory. How to send a message to your class Using the Conversations feature in Canvas Using a mailing list to contact your students [What you need to know] 
Communicate with your students through Canvas
Things You Really Need to Know about Canvas | Arts & Sciences Computing
What you need to know