Here's a step-by-step walkthrough on how to change Jira's email notifications
1. Click on the "Settings" icon in the navigation bar.


3. Here, you can change your preferences on email send triggers.

4. Here, you can change overall notification preferences and uncheck the ones for which you don't want email notifications.

5. Click on "Digests" under Notification settings.

6. Here, you can set email preferences for due or overdue work items.

7. Next, click on "Alerts" under Notification settings.

8. Here, you can change different email notification rules.

Congrats! You have successfully changed Jira's email notifications!