FIX: Show 'emails disabled' to staff users when disabled for non-staff (PR #7187)

At the moment, the “All outgoing email has been globally disabled by an administrator” banner doesn’t show to staff users if SiteSetting.disable_emails === “non-staff”. That means site admins might not realise emails are disabled until a user reports it.


You’ve signed the CLA, davidtaylorhq. Thank you! This pull request is ready for review.

ohh dear important oversight, thanks for this!

Can you also write a test for this?