[Exim] Conditional queuing

Hello Exim people,

Does anybody know is there a mech for queueing outbound mail
conditionaly? This rule might be particulary usefull when accepting
local trasnport (pipe), and the desision is made on $originator_uid or
$recipients_count. I want to enforce queuing for some users while
allowing others to do immediate SMTP delivery.

Thank You.
--
Best regards,
 Peter                          mailto:spam4octan@highway.ru