Group messages by promotions, notifications, and real people

[AzureDusk10]

Automatically sort incoming mail into 3 folders - promotions, notifications, and direct communications from people. Same as how Spark does it. 
This would work even for contacts you have never received communications from before. 
This would help make it easy to see which emails are most important and need your attention, and which ones are just marketing emails. 

[Jon]

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