Solaris Diagnostic Reporter Logs

I have 3510 Disk Array attached to T2000 sever running Solaris 10 and I have set up Diagnostic Reporter to send status update via email once a day. Since logs are growing everyday, my email is getting big too.
I cannot recall what file I need to echo > , so that only new logs are sent.

Kindly assist

Thanks

You can have a script to check the logs and rotate them