1. Scale your business email & marketing messages with Amazon Simple Email Service (SES), a cost-effective and reliable cloud email service. Sign up today.

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

  3. Mandrill is a new way for apps to send transactional email. It runs on the delivery infrastructure that powers MailChimp.

  4. 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.

  5. SMTP provides scalable affordable email infrastructure for all your sending needs.

  6. Eliminate your hard-bounces and reduce spam complaints with Xverify's email verification services that validate each unique email address. Sign up today!

  7. Premailer is a preflight for HTML e-mail that makes CSS inline, converts links and warns about unsupported code.

  8. Ariticmail is a transactional email delivery API for applications and enterprises.

  9. Postmark is the easiest and most reliable way to be sure your important transactional emails get to the inbox. Simply & reliably parse recieved email to JSON for your webapp.

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

  11. Deliver your app and website emails on time and to the inbox. Trusted to send 25% of the world's non-spam email. Email delivery for companies big and small.

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