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.
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