Hello,There are some Warning message on my Exchagne 2007 server. Source: MSExchange Extensiblility, EventID" 1050, Task Category: MExRuntime"The execution time of agent 'Connection Filtering Agent' exceeded 300000 (milliseconds) while handling event 'OnRcptCommand'. This is an unusual amount of time for an agent to process a single event. However, Transport will continue processing this message."This happened everyday when server started to backup task. Is there any one can help me with this? Much appreciated.Regards,James

Looks like you have Customized Transport agent installed on server. Have you seen below? http://www.microsoft.com/technet/support/ee/transform.aspx?ProdName=Exchange&ProdVer=8.0&EvtID=1050&EvtSrc=MSExchange%20Extensibility&LCID=1033 Run EXBPA and make sure everything is in place. also check if your exchange is up to date in terms of Service Packs and HotfixesVinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|