WordStream - WordStream offers a suite of products to help companies with their SEO and SEM initiatives.
Really Good Emails - A large collection of good product email design.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Good Sales Emails - Best sales emails from great companies
Marin Software - Optimize your Search, Social & Display ads across channels and devices. Marin Software, the leading cross-channel performance advertising platform.
Great Email Copy - A dose of emails from around the web.