Event ID - 4115

Event Id4115
DescriptionThe message from the spool file <&%$#> seems to be looping through the routing extension for the Internet Mail Service. Please check that the routing DLL is configured properly.
Event InformationAccording to Microsoft:

This behavior occurs because Internet Mail Service is connecting to itself in an attempt to deliver the message. It is important to note that this is not a problem with either Exchange Server or Windows 2000. Refer to the "More Information" section of this article for further explanation of this behavior.
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.
NOTE: 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.

This information from newsgroups may help:
Turn on the SMTP Protocol Log category of Diagnostics Logging on the IMS. Set the level to "Maximum". Stop and restart the IMS. Wait for the 4115 to show up, then stop the IMS, turn off the SMTP Protocol Log. Now have a look through the log files for the "too many hops" line and work UP the file until you see the RCPT TO header. Thatll tell you where the message was going.
This happened when I applied service pack 4 to 5.5 running service park 3. I had to change the file version in IMS to correct it and I havent been able to correct the problem in the MS Mail Connector
This problem cleared up for me once I stopped re
Reference LinksMessage Looping with Exchange Server on a Windows 2000 Domain Controller

Messages Not Delivered Due to IMS Size Restrictions

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