The options I've outlined barely scratch the surface of all the email testing possibilities available. Understanding campaign responses and their implications for future customer behavior can get into incredibly complex statistics, analytics and modeling. Fortunately, even basic testing methods can significantly enrich your ongoing customer relationships.

The real power of email isn't how easily and quickly you can send it, but how easily and quickly you can figure out what appeals to your recipients, tailor your offers accordingly and keep them coming back for more.

Additional resources
Simple Guidelines for Testing Email
Email Split Test Success
Email Segmentation for Success

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