I can't seem to locate the method within the Laravel 4 docs/Email API where I can add custom headers to an email.
For example:
Mail::send('emails.welcome', $data, function($message)
{
$message->to('foo@example.com', 'John Smith')->subject('Welcome!');
$message->headers('X-Tags', 'tag1 tag2 tag3');
});
Does anyone know how this can be done?