Unable to deliver message because the maximum hop count was exceeded. This is a potential message routing loop.

Details
Product: Exchange
Event ID: 717
Source: MSExchangeActiveSyncNotify
Version: 6.5.6940.0
Component: Microsoft Mobile Sync Server
Message: Unable to deliver message because the maximum hop count was exceeded. This is a potential message routing loop.
   
Explanation

This event indicates that the Simple Mail Transfer Protocol (SMTP) component was unable to deliver a message because the message had a hop count greater than that configured on this SMTP Virtual Server. This is a potential message routing loop.

Every time a message passes through an SMTP server, the particular SMTP server adds a line to the message header indicating the “hop count“. This indicates how many SMTP severs that message has already traversed. The SMTP Virtual Server in Exchange 2000 has a default hop count set to 15. This means that if any e-mail message reaches this SMTP server and it has a hop count of 15 in its header, the message will be rejected.

   
User Action

The hop count for an SMTP Virtual Server in Exchange 2000 can be configured to be between 10 and 256. If your topology is complex, and the messages in your organization need to be routed through several servers before being sent out to the Internet, you can suitably increase the hop count of the SMTP Virtual Server.

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