Mail flow slows significantly after installing Symantec Mail Security for Microsoft Exchange 6.x
Last Updated August 22, 2014
After installing Symantec Mail Security for Microsoft Exchange (SMSMSE) 6.x on an Exchange 2007 server and enabling Premium AntiSpam there is a significant impact on mail flow.
Symptoms This problem occurs when all of the following are installed or enabled on the Exchange 2007 server:
Client Access Role
Hub Transport Role
Symantec Premium AntiSpam
The event log contains the following entry:
Source: MSExchange Extensibility ID: 1050 Description: The execution time of agent 'SMSMSESMTPAgent' exceeded 300000 (milliseconds) while handling event 'OnEndOfData'. This is an unusual amount of time for an agent to process a single event. However, Transport will continue processing this message.