The correct option is Issue security levels.

Issue security levels determine which users or groups can view a specific issue. If a user is not allowed to view an issue because of its security level they will not receive email notifications for events on that issue. Notification delivery requires both being listed as a recipient and having permission to see the issue so security levels can effectively prevent emails from being sent to some users.

Permission schemes define what actions users can perform and whether they can browse issues and while they affect who can do what they do not directly configure which events trigger emails or which recipients get notified. Sending notifications is governed by notification schemes and by visibility rules.

Screens control which fields are shown when creating editing or viewing issues and they do not affect who receives email notifications for issue events.

Agile boards determine how issues are displayed and managed within boards and sprints and they do not change notification behavior for issue events.

Dashboards are composed of gadgets and provide a presentation view for users and they do not control the delivery of notification emails.

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