Really Good Emails - A large collection of good product email design.
Marketing Budgets 2020 - Research on budgets and effectiveness of marketing channels.
Good Email Copy - Email copy from great companies.
Attributer - Know what marketing channels are driving customers & revenue
Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
Reaching The Inbox - A free step by step guide to maximize email deliverability