Get message-id with Laravel Mailable

Is there a way to get the message-id of the to be send email within Laravel Mailables?

I currently get the id like this which just works fine, but since this doesn't support markdowns and stuff, I would prefer to get around this:

Mail::send('mail.contact.confirmation', $contactData, function (Message $message) use ($mailTo, $subject, &$headers)
{
    $headers['message-id'] = $message->getSwiftMessage()->getId();
    $message->to($mailTo)->subject($subject);
});

Thanks for any advice.

I just had to figure this out on my own, so take my answer with a grain of salt (although it works for me).

Within the "build()" function of a Laravel Mailable, you can do:

$this->withSwiftMessage(function ($swiftmessage) {
   echo $swiftmessage->getId();
});

Hopefully that gets you started. My use-case was editting the ID, so I used:

$this->withSwiftMessage(function ($swiftmessage) use ($newId) {
  $swiftmessage->setId($newId);
  return $swiftmessage;
});