Event ID - 12071

Event Id12071
DescriptionMessage MessageID with subject subject of message from sender exceeded the maximum hop count(80040C02-8200008C). The archive filename is archivename.
Event InformationAccording to Microsot:
This behavior occurs because Internet Mail Service is connecting to itself in an attempt to deliver the message.
To resolve this problem, use one of the following methods:
Add an MX record for domain.com in DNS specifying the proper mail host.
Add domain.com in the Specify by E-Mail Domain area on the Connections tab of Internet Mail Service properties specifying the proper mail host.
On the Routing tab of Internet Mail Service, configure domain.com to route to the correct destination mail host.
The first two methods are the best ways to resolve this issue. Although the third method prevents the message from looping, it still causes Internet Mail Service to first connect to itself to deliver the message and then reroutes the message to its intended destination.
Reference LinksMessage Looping with Exchange Server on a Windows 2000 Domain Controller

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