452 4.3.1 Insufficient system resources(Event ID 15006 and 15002)
KB ID 0000165 Problem When attempting to send mail to an Exchange EMail Server, you see the above error message. Usually the Exchange can send mail out and exhibits no other problems. You may also see one of the following error messages in the servers event log. This is caused by an Exchange “Feature” Called “Back Pressure”, and the usual culprit is, there is less than 4Gb (Lowered to 500Mb with SP1) on the...