Intercom on Marketing - The marketing book for startups
Really Good Emails - A large collection of good product email design.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Good Email Copy - Email copy from great companies.
Weavr Cafe - Weavr is a platform to build active learning communities.
Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.