Horde_Mime_Part::_reEncodeMessageAttachment PHP Method

    protected function _reEncodeMessageAttachment(Horde_Mime_Part $part)
    {
        $new_part = Horde_Mime_Part::parseMessage($part->getContents());
        $part->setContents($new_part->getContents(array('stream' => true)), array('encoding' => self::ENCODE_BINARY));
        $part->setTransferEncoding('base64', array('send' => true));
    }