If you are getting notifications from a course you no longer wish to receive notifications from use the following instructions to exclude those courses from your notifications. 

 Log into My Courses, click on your name in the upper right corner, and click Notifications.

On the Notifications page, scroll to the bottom. Under the Exclude Some Courses section, click Manage My Course Exclusions

In the pop-up window. Add the courses for which you wish to no longer receive notifications, then click close and Save.