gnome-shell-mailnag 3.26.0-1 (s390x binary) in ubuntu cosmic

 This package provides GNOME Shell integration for Mailnag. It includes the
 following features:
 .
   - Notifies about new mails via the messaging tray (including a counter
     badge)
   - Shows an indicator in the top panel (including counter badge and popup
     menu)
   - Lock screen integration