Xobni, a San Francisco company that seeks to improve your productivity in email usage, has raised $4.26 million in a first round of funding from Khosla Ventures, according to PE Wire, citing regulatory filings.

Xobni is yet to launch. Its name is “inbox” spelled backwards, referring to the company’s mission of letting users take control of their inbox — it provides data on things like how much time spend on email, how long it takes for them to respond and what times of day they get the most important email.

Xobni was founded in Cambridge, Mass. last year, and received initial investment from Paul Graham and his incubator Y Combinator.

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