Not including 'private' images in the mail

This works for me, should be Ok

In mimemail.inc function _mimemail_file should look like this:

function _mimemail_file($file = NULL, $type = '') {
  static $files = array();

  if ($file && !preg_match('@://|mailto:@', $file)) {
  	if (strpos($file, 'system/files?file=') !== false)
		$file = file_create_path(substr($file, strlen('system/files?file=')));
  	if (file_exists($file)) {
	    $content_id = md5($file) .'@'. $_SERVER['HTTP_HOST'];
		$name = (strrpos($file, '/') === false ? $file : substr($file, strrpos($file, '/') + 1)); 
	    $new_file = array('name' => $name,
	                      'file' => $file,
	                      'Content-ID' => $content_id,
	                      'Content-Disposition' => 'related',
	                     );
	    $new_file['Content-Type'] = _mimemail_mimetype($file,$type);
	
	    $files[] = $new_file;
	
	    return 'cid:'. $content_id;
  	}
  }
  
  if ($file) {
    return $file;
  }
  
  return $files;
}