Dear all, I found logs in Event Viewer->Application Logs as followings. Event Type: Information Event Source: MSExchangeIS Mailbox Store Event Category: Transport Delivering Event ID: 9650 Description: Message delivery is being attempted. Internet Msg Id:ID, Submit Time: 03/16/2004 17:30:01.0000000, Recipient:/o=PlankyOrg/ou=First Administrative Group/cn=Recipients/cn=username, MDB:First Storage Group\Mailbox Store (Computername). For more information, click <http://www.microsoft.com/contentredirect.asp> http://www.microsoft.com/contentredirect.asp. Event Type: Information Event Source: MSExchangeIS Mailbox Store Event Category: Transport Delivering Event ID: 9651 Description: Message was successfully delivered to ID A on /o=PlankyOrg/ou=First Administrative Group/cn=Recipients/cn=username2. Internet Msg Id:First Storage Group\Mailbox Store (computername). For more information, click <http://www.microsoft.com/contentredirect.asp> http://www.microsoft.com/contentredirect.asp. Any more attention should I pay? Thanks a lot. BR/Jobs