Really Good Emails - A large collection of good product email design.
GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!
Good Sales Emails - Best sales emails from great companies
Elevatr Email Marketing Automation - Fast and easy email marketing software
Great Email Copy - A dose of emails from around the web.
Google Sheets Email Marketing - Email automation and validations directly from Google Sheets