protected function createEnvelope()
{
$envelope = new Horde_Mime_Part();
$envelope->setName('Kolab Groupware Data');
$envelope->setType('multipart/mixed');
$description = new Horde_Mime_Part();
$description->setName('Kolab Groupware Information');
$description->setType('text/plain');
$description->setDisposition('inline');
$description->setCharset('utf-8');
$description->setContents(sprintf(Horde_Kolab_Storage_Translation::t("This is a Kolab Groupware object. To view this object you will need an email client that understands the Kolab Groupware format. For a list of such email clients please visit %s"), 'http://www.kolab.org/content/kolab-clients'), array('encoding' => 'quoted-printable'));
$envelope->addPart($description);
return $envelope;
}