From the context of Gradebook, use Message Students to send a brief message to students about a Gradebook item.
Go to Gradebook.
Select Gradebook from the Tool Menu of your site.
Click the arrow icon and then select Message Students.
Click the arrow icon (Open menu).
Select Message Students.
Configure a message and then click Send.
Enter a subject in the Subject field.
Enter the body of the message in the Message field.
Select recipients in the Who do you want to message? menu. Choose from Ungraded students, Graded students, or All students. If you've selected Graded students, optionally enter a Min score or Max score to further filter recipients.
Filter recipients using the Only students in a group? menu. Choose from Site, site groups, or sections that are available in the site.
Click Show Recipients to preview the names of recipients of the message.