Email Marketing: A Beginner's Guide - Master email marketing with these 3 short ebooks from Drip.
Really Good Emails - A large collection of good product email design.
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Good Email Copy - Email copy from great companies.
Quokka (formerly Kryptowire) - The gold standard in SAST, MAST, IAST, and more!
Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.