lib/Mailer/Postmark.php
protected function handle(ResponseInterface $response)
    {
        $httpException = new HttpException($response->getStatusCode(), $response->getReasonPhrase());

        // Not 422 contains information about API Error
        if ($response->getStatusCode() == 422) {
            $error = json_decode((string) $response->getBody());

            throw new ApiException(isset($error->Message) ? $error->Message : 'Unprocessable Entity', $httpException);
        }

        throw $httpException;
    }
protected function handle(ResponseInterface $response)
    {
        $httpException = new HttpException($response->getStatusCode(), $response->getReasonPhrase());

        // Not 422 contains information about API Error
        if ($response->getStatusCode() == 422) {
            $error = json_decode((string) $response->getBody());

            throw new ApiException(isset($error->Message) ? $error->Message : 'Unprocessable Entity', $httpException);
        }

        throw $httpException;
    }
{@inheritdoc}