Integration of MimeMail module

Hi,

I had problems with Backup and Migrate when sending emails with backup. My webhoster doesn't support current implementation of mime_mail (class responsible for sending emails with attachments located in includes/destinations.email.inc). I look into it and found solution. MimeMail module extends drupal_mail() function to support attachments. I think this is better solution and I think it should be commited to active branch. What do you think? I suggested implementation which is backward compatible below.

Just replace _backup_migrate_destination_email_mail_backup() function in this file includes/destinations.email.inc with version attached below

function _backup_migrate_destination_email_mail_backup($attachment, $to) {
  
    $mimemail = FALSE;
    
    //Check if modules mailsystem and mimemail is enabled
    if(module_exists('mailsystem') && module_exists('mimemail')) {
      
      //Check if we are using MimeMailSystem
      $mail_system = variable_get('mail_system', mailsystem_defaults());
      if($mail_system['default-system'] == 'MimeMailSystem') {        
         $mimemail = TRUE;
      }   
    }

    //if mimemail properly configured use it
    if($mimemail) {
       
       $module = 'backup_migrate';
       $key = microtime();
       $language = language_default();
       $params = array();
       $params['attachments'][] = array(
          'filepath' => $attachment->path,
          'filecontent' => '',
          'filename' => $attachment->filename,
          'filemime' => 'text/plain',
       );
       
       $from = variable_get('mimemail_mail', ini_get('sendmail_from'));
    
       $send = FALSE;
       $message = drupal_mail($module, $key, $to, $language, $params, $from, $send);
       
       $message['subject'] = t('Database backup from !site: !file', array('!site' => variable_get('site_name', 'drupal'), '!file' => $attachment->filename));
       $message['body'] = t('Database backup attached.') ."\n\n";
    
       // Retrieve the responsible implementation for this message.
       $system = drupal_mail_system($module, $key);
    
       // Format the message body.
       $message = $system->format($message);
    
       // Send e-mail.
       $message['result'] = $system->mail($message);
    
    }else{
    
        // Send mail
        $attach        = fread(fopen($attachment->path, "r"), filesize($attachment->path));
        $mail          = new mime_mail();
        $mail->from    = variable_get('site_mail', ini_get('sendmail_from'));
        $mail->headers = 'Errors-To: [EMAIL='. $mail->from .']'. $mail->from .'[/EMAIL]';
        $mail->to      = $to;
        $mail->subject = t('Database backup from !site: !file', array('!site' => variable_get('site_name', 'drupal'), '!file' => $attachment->filename));
        $mail->body    = t('Database backup attached.') ."\n\n";
      
        $mail->add_attachment("$attach", $attachment->filename, "Content-Transfer-Encoding: base64 /9j/4AAQSkZJRgABAgEASABIAAD/7QT+UGhvdG9zaG", NULL, TRUE);
        $mail->send();
    } 
}

I think it could be part of Backup and Migrate module.