When logged into Postmark, select the server and go to the “Settings” page. Then select the ”Outbound“ tab where you can enable open tracking for that server.
Once enabled, all outbound HTML emails being sent through this server will track all opens.
You can modify the
TrackOpens field for a specific server using the Server API to edit an existing server.
If open tracking is already enabled for your server, you can disable it for a single email by setting the
TrackOpens field to
false when using the Email API.