protected function _setACL(Horde_Imap_Client_Mailbox $mailbox, $identifier, $options)
{
// SETACL returns no untagged information (RFC 4314 [3.1]).
$this->_sendCmd($this->_command('SETACL')->add(array($this->_getMboxFormatOb($mailbox), new Horde_Imap_Client_Data_Format_Astring($identifier), new Horde_Imap_Client_Data_Format_Astring($options['rights']))));
}