mailchimp.com
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Mailchimp is an all-in-one marketing platform focused on email marketing, automation, and audience management. It offers email templates, automation workflows, landing pages, CRM features, and a wide range of tutorials, guides, and resources to help you plan and optimize campaigns.
More resources on Email Marketing
hubspot.com
HubSpot is a marketing, sales, and CRM platform whose site offers extensive educational content on email marketing. It features blogs, how-to guides, tutorials, templates, and free tools to plan, create, automate, and optimize email campaigns.
constantcontact.com
Constant Contact is an email marketing platform for small businesses that lets you build and send campaigns with templates, automation, sign-up forms, landing pages, and analytics; the site also offers tutorials, guides, and resources on email marketing best practices.