Really Good Emails - A large collection of good product email design.
Good Email Copy - Email copy from great companies.
Stamp Ready - Create & send email campaigns simplified
Good Sales Emails - Best sales emails from great companies
MooSend - Moosend allows you to design and send your email marketing campaigns and track the results from an easy-to-use web interface as well as a direct SMTP server connection for your smtp client or web application.
Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.