I setup limits on the size of messages that can be sent and received via our Exchange 2000 system. The limits are working fine except for one issue. When an external user sends a large mail message to our Exchange system, it will not pass through the message if it is larger than our limit set. However, no message is actually sent back to the user. As a result the sender never knows that the message is not received by the user here. Any place where I need to turn some type of notification on??