From looking at your screenshot, it seems like this is a Bitbucket instance, not a Jira instance. So I am a bit confused if Jira is involved here at all or if perhaps this is just a misunderstanding.
I would only expect this configuration page to handle notifications from Bitbucket. So perhaps there is a disconnect between which application is sending notifications and what you can change here.
Are you sure this site is the one sending out notifications? Perhaps if you can share a screenshot of the notification example you received we might have a better understanding of where this originated from.
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
We're bringing product updates and pro tips on teamwork to ten cities around the world.Save your spot