{"error":"An error occurred processing the json data you sent with the request. Please make sure the data conforms to the specification for this call (see the documentation here: https:\/\/developers.smtp2go.com\/reference\/introduction-1) and try again. Don't forget to set Content-Type to 'application\/json'.","error_code":"E_ApiResponseCodes.NON_VALIDATING_IN_PAYLOAD","field_validation_errors":{"fieldname":"custom_headers[0].value","message":"The field 'custom_headers[0].value' was expecting a value with a length between 1 and 255 but found a value with length of 0, Please correct your JSON payload and try again."}}