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In case while you’re tring setting up alerts in your WSUS Server you got the following error:

System.Net.Mail.SmtpException: Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender
at Microsoft.UpdateServices.Internal.BaseApi.SoapExceptionProcessor.DeserializeAndThrow(SoapException soapException)
at Microsoft.UpdateServices.Internal.DatabaseAccess.AdminDataAccessProxy.SendTestEmail(String emailLanguage, String smtpUserName, String senderEmailAddress, String smtpHostName, Int32 smtpPort, String recipients)
at Microsoft.UpdateServices.Internal.BaseApi.EmailNotificationConfiguration.SendTestEmail()
at Microsoft.UpdateServices.UI.SnapIn.Dialogs.EmailNotificationSettingsDialog.backgroundWorker_DoWork(Object sender, DoWorkEventArgs e)

If you’re using Exchange Server as mail server and your receive connector have enabled both anonymous and integrated authentication, WSUS will authenticate as the computer account, for that reason it doesn0t accept the e-mail addres you’ve put it in (I suppose will never accept any e-mail adddress, until you got a “mailbox enabled computer account” :-) ).

The 2 possible workaround are:

  • Create a service user account with permission to send e-mail and configure it into WSUS options
  • Modify Exchange connector/SMTP Server in one of the following ways:
    • Disable Integrated Authentication in the current Receive Connector (2007-2010) or SMTP Servwer (2003)
    • (2007-2010) Create a dedicated connector for the IP address of the WSUS Server that allow only TLS authentication and anonymous users