Event ID - 4003

Event Id4003
DescriptionThe domain '%1' is currently unreachable.
Event InformationAccording to Microsoft :

This event may be seen when the named domain is not reachable for a variety of reasons. As mentioned above, there may be several causes, but the following three are most common.
1.The DNS server is unable to resolve names.
2.The SMTP Virtual Server or SMTP Connector may be misconfigured.
3.Default Internet Message Format may be set to a specific domain

1.Ensure that the DNS Server configured for use by the Exchange 2000 Server is able to resolve names correctly.
2.Check and make sure that the SMTP Virtual Server and/or the SMTP Connector is/are correctly configured.
3.Change Default Internet Message Format to so it has an * in the Domain "
Reference LinksEvent ID:4003 Of Source ID:MSExchangeTransport

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