The notifications appear in the upper right-hand corner of your screen, without interrupting what you’re doing.
Note: If you are an Outlook user, you need to download Mailbutler’s Companion app for macOS from here in order to receive notifications.
Enable Mailbutler notifications on macOS
1. Open your System Preferences.
2. Go to Notifications.
3. Select Mailbutler from the list of apps on the left. Tick all the notification boxes.