private function parseMessage($message)
    {
        if (!$message) {
            return false;
        }

        $startLine = null;
        $headers = [];
        $body = '';

        // Iterate over each line in the message, accounting for line endings
        $lines = preg_split('/(\\r?\\n)/', $message, -1, PREG_SPLIT_DELIM_CAPTURE);
        for ($i = 0, $totalLines = count($lines); $i < $totalLines; $i += 2) {

            $line = $lines[$i];

            // If two line breaks were encountered, then this is the end of body
            if (empty($line)) {
                if ($i < $totalLines - 1) {
                    $body = implode('', array_slice($lines, $i + 2));
                }
                break;
            }

            // Parse message headers
            if (!$startLine) {
                $startLine = explode(' ', $line, 3);
            } elseif (strpos($line, ':')) {
                $parts = explode(':', $line, 2);
                $key = trim($parts[0]);
                $value = isset($parts[1]) ? trim($parts[1]) : '';
                if (!isset($headers[$key])) {
                    $headers[$key] = $value;
                } elseif (!is_array($headers[$key])) {
                    $headers[$key] = [$headers[$key], $value];
                } else {
                    $headers[$key][] = $value;
                }
            }
        }

        return [
            'start_line' => $startLine,
            'headers'    => $headers,
            'body'       => $body
        ];
    }