Can I turn off email notifications?
If you'd like to stop receiving notifications for a single issue, you can unfollow that issue. Navigate to the issue you no longer want to follow. Then just click the Unfollow button to the right of issue subject.
If you are the opener or assignee, you'll need to select another team member first. But after that, you'll stop receiving notifications for that issue unless you comment on it in the future.
If you'd like to turn off all notifications for your user account, just go to Settings, then click the Email & Notifications tab. Click Notifications in the right sidebar. You can opt-out of email notifications or, if you'd like, select a daily summary as a less chatty alternative.