Skip to main content

What Is an Email API

An email API lets an application send email through HTTPS requests. Instead of handing a message to an SMTP relay, your application sends structured JSON with recipients, content, templates, and metadata.

Use an email API when you need:

  • Server-side templates.
  • Per-recipient substitution data.
  • Attachments and metadata.
  • A structured response.
  • Webhook reconciliation.

Use SMTP when you need compatibility with an existing mail client or legacy application.