First, let’s start with a quick reminder of what an API is. API is a kind of a communication mechanism different programs use to talk to each other. An email API, is an interface that lets an app connect to an email service provider so it can send emails and use other features like tracking and analytics. The email API meaning is simple: it helps developers send emails automatically and use advanced email tools right from their app.
You can send emails using either SMTP API or HTTP API – as of their differences, HTTP (Web) API is much more efficient in terms of sending speed and supported functionality, while SMTP connection is more universal and faster to set up.
