I have an error occur and its auto shutdown the email server. The system event error is show as below :Event Type : ErrorSource : System ErrorEvent Category : (102)Event ID : 1003Date : 11/10/2008Time : 10:12:07 AMUser : n/aComputer : MAILTERMINALDescription : Error code 1000000a, parameter1 544b5020, parameter2, 00000002, parameter3 00000000, parameter4 8053c2d8.For more information, see Help and Support Centre athttp://go.microsoft.com/fwlink/events.asp

Your server crashed and shutdown as per your crash recovery settings of the OS. What caused the crash can be determined by information contained in crash dump. If you have crash dump of full memory and you need to find root cause, you should open a support incident.

Supplement: How to read the small memory dump files that Windows creates for debugging Windows does not save memory dump file after a crash