Event ID - 4000

Event Id4000
DescriptionMessage delivery to the remote domain %1 failed for the following reason: %2
Event InformationCAUSE:
This event may be seen when the SMTP Service on an Exchange 2000 Server has one or more mail-delivery problems. These mail-delivery problems could be caused by several factors like DNS, IP Configuration, wrong DLL files installed, etc.
Internet facing Network Card is lower in the binding order than the Internal facing Network Card.
The Domain Name System (DNS) server does not support TCP queries.
The Exchange specific files may have been overwritten by older files from the Windows 2000 OS. This is an unlikely situation.

1. Change the IP Configuration so that the Internet facing Network Card is higher up in the binding order.
2. Use a different DNS Server that supports TCP Queries. Alternatively, configure the DNS Server so it does not use TCP queries and uses (User Datagram Protocol) UDP instead.
3. Make sure that the Exchange 2000 version of the files are installed by running Exchange 2000 Setup and choosing REINSTALL.
Reference LinksMicrosoft product: Exchange Version: 6.5.0000.0 Event Source: MSExchangeActiveSyncNotify Event ID: 4000

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