Event ID - 4006

Event Id4006
DescriptionMessage delivery to the host SmartHost failed while delivering to the remote domain SmartHostFQDN for the following reason: The remote SMTP service rejected AUTH negotiation. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Event InformationRefer following Microsoft article for more information about this event.
Reference LinksCannot send external mail when your smart host server is different from the ISP server where your e-mail is stored in Windows Small Business Server 2003

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