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Event ID: 9158 Source: MicrosoftOperationsManager

Failed to send SMTP message. <error message>. The server response was: <server response>.
In my case, restarting the MOM service (net stop mom, net start mom) fixed the problem.
By default, MOM 2005 uses NTLM to authenticate the SMTP server that is listed in the E-mail Server global settings in the MOM 2005 Administrator console before MOM 2005 sends the e-mail notification response. If the SMTP server does not support NTLM authentication or is configured to accept anonymous authentication, this event is logged. See ME885741 to solve this problem.
Check your email server settings and then the email server availability. Go to MOM 2005 Administrator Console -> Administration -> Global Settings -> tab "e-mail server".

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