Really Good Emails - A large collection of good product email design.
Mailivery - Reach the Inbox, not the spam folder.
Good Email Copy - Email copy from great companies.
Sidemail - The simplest way to send transactional emails. Sidemail makes sending transactional emails trivial, it's perfect for side projects, MVPs or the next big thing.
Good Sales Emails - Best sales emails from great companies
Postal - Open source mail delivery platform, alternative to Mailgun or Sendgrid