Dear So-and-So,

 

I know you're really busy and that you get a lot of emails, so this will only take sixty seconds to read. (Make sure it only takes 60 secs)

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Next paragraph you write who you are: add one or two lines that establish your credibility.

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And then another paragraph again one or 2 lines where you ask your very specific question and the problem you can solve for the company. 

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I totally understand if you're too busy to respond, but even a one or two line reply would really make my day.

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Kind regards

(Name)