$file = fopen('path/to/file.eml', 'r');
$message = \bashkarev\email\Parser::email($file);

$message->textHtml();

$message->getParts();
$message->getAttachments();

$file = fopen('path/to/file.eml', 'rb');
$message = \bashkarev\email\Parser::email($file);
foreach ($message->getAttachments() as $attachment) {
    $attachment->save('dir/' . $attachment->getFileName('undefined'));
}

$file = fopen('path/to/file.eml', 'rb');
$message = \bashkarev\email\Parser::email($file);
$attachment = $message->getAttachments()[0];
header("Content-Type: {$attachment->getMimeType()};");
header("Content-Disposition: attachment; filename=\"{$attachment->getFileName('undefined')}\"");
$attachment->getStream()->copy(fopen('php://output', 'c'));

$block = \bashkarev\email\Parser::email([
    fopen('path/to/part.1.eml', 'rb'),
    fopen('path/to/part.2.eml', 'rb'),
]);
$block->getMessage();

$file = fopen('path/to/file.eml', 'rb');
$container = \bashkarev\email\Parser::email($file);
$message = $container->getAttachments()[0]->getMessage();

$file = fopen('path/to/file.eml', 'rb');
$container = \bashkarev\email\Parser::email($file);
foreach ($container->getAttachments() as $attachment) {
    if ($attachment->getMimeType() === 'message/feedback-report') {
        /**
         * @var \bashkarev\email\messages\Feedback $feedback
         */
        $feedback = $attachment->getMessage();
        $feedback->getType(); // Feedback::TYPE_ABUSE ...
    }
}

$file = fopen('path/to/file.eml', 'rb');
$container = \bashkarev\email\Parser::email($file);
foreach ($container->getAttachments() as $attachment) {
    if ($attachment->getStream() instanceof \bashkarev\email\transports\Ftp) {
        /**
         * @var \bashkarev\email\transports\Ftp $transport
         */
        $transport = $attachment->getStream();
        $transport->username = 'username';
        $transport->password = '******';
        $attachment->save('dir/' . $attachment->getFileName('undefined'));
    }
}