Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
Email Tuna - Explore newsletters without subscribing
EmailWay - Collection of the most insightful and informative email newsletters from across a wide spectrum of industries and interests
Newsletters by Refind - The easiest way to email a link digest to your fans
Really Good Emails - A large collection of good product email design.
Discover by Revue - A directory of personal newsletters