Really Good Emails - A large collection of good product email design.
MemberVault - MemberVault is a flexible platform that helps you to create, deliver, and sell your services, courses, memberships, subscriptions, etc.
Good Sales Emails - Best sales emails from great companies
Opentute - Opentute helps businesses to effortlessly launch a private eLearning and communication platform to engage teams and clients.
Great Email Copy - A dose of emails from around the web.
Ruzuku - Ridiculously easy online courses