Webhosting problem - Not delivering mail because it thinks it's local

[Freakin]

So here's the problem I have.

It's a cpanel linux VPS that I'm hosting a bunch of sites on. For some of the sites, I am using Google apps for domains instead of using the server for the mail.

When a site on the server attempts to deliver email to one of the users on one of the domains that google is handling mail for, it never appears in the inbox.

I assume this is because the domains are on the server so it believe that it is local mail it is attempting to deliver.

how do I tell it to query the MX records and deliver mail to the proper destination?

Thanks,

Freakin