Here is the description of response attributes, which returns in the form of JSON.
|long||It returns the total number of recipient value which returns after Test email sent successfully.|
Here is the possible error messages, which return if any condition gets failed or required data is missing for processing.
|Error code||Error Description|
|400||The request could not be understood by the server due to malformed syntax.|
|401||You are not authorized to view the resource.|
|403||Accessing the resource you were trying to reach is forbidden.|
|404||The resource you were trying to reach is not found.|