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gettin event ID 100 when logging in

i am getting the folowing error message when i look at my event viewer. this is a webserver that we host our websites on. users from the outside have access to this site. i am not sure if someone is trying to hack my system or what. if anyone has a way to stop this that would help.

it is running w2k3 sp 2

Event Type:      Warning
Event Source:      SMTPSVC
Event Category:      None
Event ID:      100
Date:            4/27/2009
Time:            12:51:22 AM
User:            N/A
Computer:      WEB2
The server was unable to logon the Windows NT account 'webmaster' due to the following error: Logon failure: unknown user name or bad password.  The data is the error code.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
0000: 2e 05 00 00               ....    
2 Solutions
Donald StewartNetwork AdministratorCommented:
James MurrellProduct SpecialistCommented:
http://technet.microsoft.com/en-us/library/cc726142.aspx here is microsofts answer to your question

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