All scheduled, or only those scheduled to email?
What happens when youschedule them just to run?
What version of CE do you have?
You need to set up the email server properly, with a valid account, and youmust complete the email portion of the sceduling properly, versions vary in how and what must be done.
Make sure you followed the admin guide carefully.
If it's all reports that fail, then we've a serious problem here, youmight check the Event Log in either case.
-k