Plesk Scheduler and Plesk BU Error ?

[globalmcs]

I keep getting these two errors every time a scheduled backup runs and I never get the notification, it looks like its trying to send the e-mail nonfiction but something is not right....
Any ideas?

Event Type: Error
Event Source: Plesk Scheduler
Event Category: None
Event ID: 0
Date: 5/16/2005
Time: 4:00:37 AM
User: N/A
Computer: COMPUTER-NAME
Description:
System.Web.HttpException: Could not access 'CDO.Message' object. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x8004020F): The server rejected one or more recipient addresses. The server response was: 503 This mail server requires authentication. Please check your mail client settings.

--- End of inner exception stack trace ---
at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)
at System.RuntimeType.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParameters)
at System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args)
--- End of inner exception stack trace ---
at System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args)
at System.Web.Mail.CdoSysHelper.Send(MailMessage message)
at System.Web.Mail.SmtpMail.Send(MailMessage message)
at psa.scheduler.service.RunTask.Run()

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.


**************************************************


Event Type: Error
Event Source: Plesk BU
Event Category: None
Event ID: 0
Date: 5/16/2005
Time: 4:00:37 AM
User: N/A
Computer: COMPUTER-NAME
Description:
System.Web.HttpException: Could not access 'CDO.Message' object. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x8004020F): The server rejected one or more recipient addresses. The server response was: 503 This mail server requires authentication. Please check your mail client settings.

--- End of inner exception stack trace ---
at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)
at System.RuntimeType.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParameters)
at System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args)
--- End of inner exception stack trace ---
at System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args)
at System.Web.Mail.CdoSysHelper.Send(MailMessage message)
at System.Web.Mail.SmtpMail.Send(MailMessage message)
at dump.MainForm.SendMail(String body, DumpParams _params)

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.