Changing smart host forwarding interval

Hello,

I have set up our Domino server to forward external messages to a smart host (our original mail server). This works fine except there is a long delay between forwarding cycles. It looks like mail will get held in the router for about 30 minutes before sending all queued messages at once. Many users find the delay frustrating. Is there a way to have forwarding happen instantaneously, i.e. a message gets forwarded as soon as it arrives? Thanks.