Currently only shows 5 emails but the limit is way too low.

Set limit to 100

Estimated: 1h

Test notes

Using a desktop client

• Login with a user that has more than 5 missed notifications and make sure to quickly blur the window (notification won't show if the window is focused).
• See that more than 5 notification are shown. This might be hard to spot on gnome as it only keeps 3 notifications per app in the Notification Tray, so either watch for the notification pops or test on windows for example.