enable message tracking in Exchange Server 2003

1. Start Exchange System Manager.
2. Expand Administrative Groups, expand AdministrativeGroupName, expand Servers, expand ServerName, and then click Properties.
3. Click the General tab.
4. To log information about the sender, about the time the message was sent or received, about the message size and priority, or about the message recipients, click to select the Enable message tracking check box.
5. To record the subject of any message sent to, sent from, or sent through the server, click to select the Enable subject logging and display check box.  
6.  By default, the tracking logs are located in the C:\Program Files\Exchsrvr\YourServerName.log folder. Each daily log is named in the yyyymmdd.log format according to the date that the log was created.

 For message tracking Event ID's list

http://pca2z.blogspot.in/2012/05/exchange-server-2003-message-tracking.html