Transactional emails are emails based on a specific action. Those emails are automated sent, via a email provider/API.Add your suggestion Subscribe to this list
Thanks to code wrappers, easy to start. Also included marketing emails and newsletter.
Has a nice free tier with 10,000 emails a month. Easy to start.
Mandrill is the email-API from Mailchimp. Good interface. Option to save the email sent for archiving.