Most e-mails should be about five sentences long, according to serial entrepreneur Guy Kawasaki. "Less than five sentences is often abrupt and rude, more than five sentences wastes time," he notes. Make sure your e-mails answer key questions, including who you are and what you want, but eliminate unimportant details, Kawasaki recommends. However, feel free to make your e-mails longer when you are praising the recipient, he advises.

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