$mailParser = new ZBateson\MailMimeParser();

$handle = fopen('file.mime', 'r');
$message = $mailParser->parse($handle);         // returns a ZBateson\MailMimeParser\Message
fclose($handle);

echo $message->getHeaderValue('from');          // user@example.com
echo $message->getHeader('from')->getName();    // Person Name
echo $message->getHeaderValue('subject');       // The email's subject

$res = $message->getTextStream();               // or getHtmlStream
echo stream_get_contents($res);

$att = $message->getAttachmentPart(0);          // first attachment
echo $att->getHeaderValue('Content-Type');      // text/plain for instance
echo $att->getHeaderParameter(                  // value of "charset" part
    'content-type',
    'charset'
);
echo stream_get_contents(
    $att->getContentResourceHandle()
);