1. MailChimp is the best way to design, send, and share email newsletters.

  2. Email analytics made simple. shiftmail provides a REST API and web interface for intelligence gathering within email marketing.

  3. A set of powerful APIs that enable you to send, receive and track email from your app effortlessly whether you use Python, Ruby, PHP, C#, Node.js or Java.

  4. Learn why more developers choose SendGrid for their email deliverability service to send transactional emails triggered by web apps. Get started for free

  5. Marketo's powerful marketing automation software helps marketers master the art & science of digital marketing to engage customers and prospects.

  6. HubSpot is an inbound marketing and sales platform that helps companies attract visitors, convert leads, and close customers.

  7. All-in-one email service provider that provides maximum insight and deliverability results for both marketing and transactional emails.

  8. A simple API to integrate print & mail solutions into your applications.