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It's like Gmail's Priority Inbox feature in that it looks at your messages and prior history engaging with those senders and decides which emails you're likely to deem most important.

Priority Inbox is trainable in this way, as well; the more you move stuff around, the better it gets at categorization. But I prefer SaneBox.

SaneBox gives you a custom dashboard including a timeline that graphs how many important and less important emails you get every day. My current average, according to SaneBox, is 81 a day. If I took a minute to read, digest, and respond to each one of them, that's nearly an hour and a half a day going through email. If you figure there's at least 250 work days in a year, I'm spending 375 hours annually on email. That's not acceptable.