When the response HTTP Code is 200 OK message body contains a JSON with a single property called trackingId.
This property may be used at later stages to retrieve the message status.
The tracking id of the transactional email execution
When an error occurs due to data passed by the client, the system returns one of the following extended code to clarify the exact reason.
The provided sender domain is invalid. It needs to get added and verified to be used.
The provided sender is invalid. It needs to get added and verified to be used.
The provided sender is unverified. It needs to get verified to be used.
No active transactional email subscription exists
In case resources are not enough to send email (depleted or limited)