It is possible to subscribe a single email address to the event in notification scheme: https://confluence.atlassian.com/jira/creating-a-notification-scheme-185729542.html#CreatingaNotificationScheme-Addinganeventrecipienttoanotificationscheme
There is a restriction that the issue must be Public (browsable for anyone) - its Ok.
I wonder how I can do the same for the filter that returns issues that are browsable for anyone?
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