Overview

Integration

User guide

API reference

Webhooks

Tracking opens per email

Using the REST API

For a single HTML email, add the property TrackOpens with a value of true. The default value of TrackOpens is false, so if it is not present or set to false Postmark will not add open tracking to that email.

{
  ...
  "TrackOpens": true
}

Using SMTP

For an SMTP email with an HTML part, add the header X-PM-TrackOpensto your email and set it to true. If the header is not present or set to false Postmark will not add open tracking to that email.

X-PM-TrackOpens: true