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

        // 4xx will content error information in the body encoded as JSON
        if (!in_array($response->getStatusCode(), range(400, 417))) {
            throw $httpException;
        }

        $error = json_decode((string) $response->getBody());
        $message = '';
        foreach ($error->errors as $i => $e) {
            $message .= sprintf(
                "ERROR #%d: \nField: %s \nMessage: %s \nHelp: %s\n\n\n",
                $i,
                isset($e->field) ? $e->field : '-',
                isset($e->message) ? $e->message : '-',
                isset($e->help) ? $e->help : '-'
            );
        }

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

        // 4xx will content error information in the body encoded as JSON
        if (!in_array($response->getStatusCode(), range(400, 417))) {
            throw $httpException;
        }

        $error = json_decode((string) $response->getBody());
        $message = '';
        foreach ($error->errors as $i => $e) {
            $message .= sprintf(
                "ERROR #%d: \nField: %s \nMessage: %s \nHelp: %s\n\n\n",
                $i,
                isset($e->field) ? $e->field : '-',
                isset($e->message) ? $e->message : '-',
                isset($e->help) ? $e->help : '-'
            );
        }

        throw new ApiException($message, $httpException);
    }
{@inheritdoc}