This is an updated Process Tracking Log (PTL) tool for use with both Exchange 2007 and Exchange 2010 and can be used to analyze the information in Exchange message tracking logs.

PTL may help in following situations:

• Message Looping
• Message failures, such as in Delivery Status Notifications (DSNs)
• List of top mail senders
• List of top mail recipients
• Top large message size generators
• Queues backing up
• Performance issues due to message load
• Simply monitoring server message load

You can read more about it in the following blog post:

http://blogs.technet.com/b/exchange/archive/2011/10/21/updated-process-tracking-log-ptl-tool-for-use-with-exchange-2007-and-exchange-2010.aspx