Internet Mail still flowing through 5.5 after 2003 upgrade

[vkalra]

Hey Everyone,

Maybe someone can help me out here. We have recently upgraded from Exchange 5.5 to Exchange 2003. For the time being, the server must run in parallel. However, we would like all outbound Internet mail to route through the Exchange 2003 box. Currently, all mail routes through the Exchange 5.5 IMS. Is there a way to force all e-mail to route through the 2003 box without taking the 5.5 box offline? Also, I did try stopping the IMS service, however, this causes all outbound mail to stop flowing all together.

Thanks,

Vinod