Why aren't administrators receiving email notifications when a draft is sent to them for review?

Greetings all - thanks for taking the time to look at this and (hopefully) answer.

First off, I'm using Adobe Contribute CS3, Version 4.

We have a couple people that are able to edit pages that need to be sent for review.  When they send to an administrator for review, though, there is no email notification saying that there's a page awaiting review.

I've searched around Contribute, and can't find anywhere to turn on email notifications.  Can anyone tell me where I can turn on email notifications???

Thanks!