This product is built as a service that allows its customers to send email and SMS marketing campaigns. The application provides its own SPMT servers and at the same time works with all known email service providers like Amazon(SES), Mailgun, Sendgrid, Postmark, Sparkpost, and more.
The email sending process is developed in low-level programming languages so as to allow customers to control sending time and speed.
The application has a strong infrastructure that handles a bunch of requests to track each email live from sending to delivering to the provider. A/B testing and a lot of statistic tools are integrated into the app to advise users right usage of the service and not to be spammed.