If no reply received to sent email -> bring back to inbox
Make it possible to require reply to the sent email by certain time. If no reply received, return that email back on top of the inbox. This would be a killer feature! Similar functionality is provided by Boomerang extension for Gmail as well as SaneBox email service.

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Anonymous commented
Same here, but way simplified UI to Boomerang.
Coolest would of course be if it could analyse the outgoing mail for things that would require a response based on the contents.
But for now this would cover most use cases:
- Simple check-box in the compose or read view to tag a thread that it's pending a response.
- When hitting send, a modal dialog would offer the default delay (hit enter to send with say 2days until the email should pop back up), and shortcuts to set the number of days in the future, like arrow-keys +/-1 day.
- Replying to a thread like this could offer a 2nd send button to simplify the workflow when sending the last response
... thanks for sending the quotation. -> hit "send & resolve"
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Lucas Nelson commented
I really wish this were done. It's one of my favorite features of Gmail + Boomerang.
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Maelle commented
I agree, killer feature!