Want to help your students be prepared for the first day of class but don't want to publish your Canvas course? Use the Course distribution list for your course section in Gmail! All courses get them once they are active in SIS. When you send an email this way any student that is registered for your course at the time will receive your message*! Remember to Blind Carbon Copy your students so that if they reply all the other students will not receive the email. This is the same as checking the box to send an individual message to students in Canvas. 
*This function remains available for 90 days after the semester ends, but you need to add ".completed" to the address. Example: 
Current Student Gmail Group: 
CGC.2021.Spring.BPC.110.21561@cgc.edu

Completed Student Gmail Group (students have been graded in SIS): 
CGC.2021.Spring.BPC.110.21561.completed@cgc.edu