A way to clean ISO-8859-1 embedded in mail subjects or filenames

Thanks for this splendid module...

The problem :
User Agents, such as Thunderbird, encodes both subject and filenames using ISO-8859-1, UTF8 or other if a special caracter is present in it.
For example, a mail with subject "Fwd : boite à lettres' appears as : Fwd: boites =?ISO-8859-1?Q?=E0_lettres?= ... Ugly.

The issue :
Maybe this is not the right way to address the problem, I am a newbie into Drupal... but this hack works for me...

I have changed Mailhandlerparser.inc to run mb_decode_mimeheader before sending back the result :

  public function parseAttachments(&$message) {
    $message['attachments'] = array();

    foreach ($message['mimeparts'] as $attachment) {
      // 'unnamed_attachment' files are not really attachments, but mimeparts like HTML or Plain Text.
      // We only want to save real attachments, like images and files.
      if ($attachment->filename !== 'unnamed_attachment') {

         $cleanfilename = mb_decode_mimeheader($attachment->filename);
		$file = file_save_data($attachment->data, file_directory_temp() . '/' . $cleanfilename);
        

        $message['attachments'][] = new FeedsEnclosure($file, $attachment->filemime);
      }
    }
   

and

  public function parseExtensions(&$message) {
    // Populate $message with all values from 'header' object.
    $parts = (array) $message['header'];
    foreach ($parts as $key => $value) {
      // Some keys are already taken, so do not overwrite them.
      if (!in_array($key, array('header', 'origbody', 'mimeparts', 'mailbox', 'attachments'))) {

	    if ( $key == array('subject') ) {
		    $message[$key] = $value;
        }
		else
		{
			$message[$key] = mb_decode_mimeheader($value);
		}
      

      }
    }
  }
  

This way, filenames and subjects are now nice....

Attached the file (built on the version of january 14th 2011). Sorry, I don't know how to create a patch file ...

Hope this helps... I spent hours finding a solution, after trying to set up lots of input filters ...