I have this problem for a whole week! When I start my smtp, it could not be start and show the following error: "The service has returned a service-specific error code.""Check the windows Event Viewer for details."When I check the event log, I have find:Source: MSExchangeFBPublishCategory: GeneralEvent ID: 8213"System Attendant Service failed to create session for virtual machine _____. The error number is 0xc103073a".Source: SMTPSVCCategory: NoneEvent ID: 115"The Service could not bind instance 1. The data is the error code. " data " 0000: 1e 27 00 00"Details about my Exchange:Hardware : Dell, currently no fault.Windows : Windows Server 2003Exchange : Exchange Server 2003 AD Environment : Mixed mode Anti-Virus: Virus Chaser , but i have change to NOD32 for troubleshoot.Antigen for exchange 9.0Other SMTP software : no.After I have use this event id the check support microsoft, I have found many KBbut it seems no one is work for us ! "http://support.microsoft.com/kb/186810/en-us" <== It doesn't work event i have assign an address. "http://support.microsoft.com/kb/322023/en-us" <== when i use netstat -an|Find ":25" , no progarm is using this port."http://support.microsoft.com/kb/281760/en-us" <== This KB is not apply to us."http://support.microsoft.com/kb/271410/en-us" <== I have upgrade it to Exchange 2003 SP2