Plus, people are always more willing to do something if you ask them directly rather than just hoping they ll do what you want.

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You could, for example, create three versions of the same newsletter, each with a different subject line, and send it to 1,000 people on your database; after a few hours, you ll be able to identify which subject line led to the best open rate, and then send a message with the winning subject line to the remainder of your list.