- Click File
- Click Manage Rules and Alerts
- Make sure your inbox is selected in Apply changes to this folder
- Click New Rule...
- Choose Apply rule on messages I receive and then click Next
- Uncheck any conditions and click Next.
- Click Yes to the warning about the rule being applied to every mail message received.
- Click "display a Desktop Alert" and click Next.
- Click Next.
- Give it a name if you want and click Finish.
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