XCON: Message Transfer Agent Stops on 9405 Errors

The Microsoft Exchange Server message transfer agent (MTA) may stop and record a 9405 event in the Windows NT Event Viewer. The 9405 event is from the Field Engineering category:

Access to a connector such as the Internet Mail Service, located on the affected server, is limited using distribution lists (DLs). Because of this restriction, transferred messages have to be checked against this access limitation and the DLs have to be expanded. Depending on the size and the nesting level of the DLs, this may cause the error above.

To resolve this problem, obtain the latest service pack for Exchange Server 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 4.