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Email Marketing by the Numbers: How to Use the World’s Greatest Marketing Tool to Take Any Organization to the Next Level by Ali Sales, Chris Baggott

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Determine Which Segments You Will Test

Determine the overall audience for which the results will apply and then determine the size of that audience. If you’ve come this far, you realize that not all of your subscribers are equal. If you are going to send different emails to different segments, then you need to identify those segments and test different versions within those segments.

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