Here are some of the best email marketing books:

1. "Email Marketing Rules" by Chad S. White
   A comprehensive guide covering the best practices for email marketing and strategies to improve campaigns.


2. "The New Email Revolution" by Robert W. Bly
   A practical guide to using email for business and how to write compelling emails that convert.


3. "The Art of Email Marketing" by Matthew Paulson
   Focuses on building and growing your email list, creating effective email content, and optimizing your strategy.


4. "Contagious: How to Build Word of Mouth in the Digital Age" by Jonah Berger
   While not solely about email marketing, this book helps you understand what makes content (including emails) go viral.


5. "Mailchimp for Dummies" by Matthew David
   Ideal for beginners, this book focuses on using Mailchimp effectively, one of the most popular email marketing tools.

These books cover various aspects, from strategy to execution, and can help you refine your email marketing efforts.

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