There was a similar question on How can I configure my notification settings so that people aren't notified by their own actions? which outline the following ways to update the notification settings:
Individually: Profile > My changes > Notify Me
Globally 1: Administration > Issues > User Settings > User Preferences
Globally 2: Administration > General Configuration
However, I can't find the setting under any of the administration tabs on JIRA v6.3.15
Is this setting still available, and if so, where?
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