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

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

  5. JangoSMTP is a transactional email delivery service that adds tracking and authentication to email.

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

  7. D

    Create and Change Transactional Email Faster.

  8. PostageApp is an email management service that makes it easy to design, deliver, and manage all of the email that websites or applications send.

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

  10. 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.

  11. 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.

  12. Accordium helps salespeople win customers and close deals faster with video proposals, sales automation and e-signatures.