IIS 2000 Error

Unable to deliver this message because the follow error was
e> ncountered: “This message is a delivery status notification that cannot
b> e delivered.”.

> The specific error code was 0xC00402C7.

>
T> he message sender was <>.

Getting this message on a 2000 Server IIS But no Exchange.
All mail going to Badmail folder with that message also.
Any ideas on a solution greatly appreciated.