Choose one of this 3 methods to connect to Doppler Relay and discover the power of Transactional Emails. If you select the SMTP option you’ll be using the easiest and simplest way to connect. By choosing to use our API methods you’ll get more flexibility for your sendings and if you generate a FTP connection you’ll be able to manage a large volume of emails at the same time. Analyze the best fit for your needs and then get access to the proper documentation: