Symantec Messaging Gateway Alert - A service is not responding or working

Hi,

We keep getting this alert every 30mins:

======================= ALERT NOTIFICATION ================================              

The following system components are not responding/working:

Host                     Component                Problem

---------------------------------------------------------------------------

sgw1                     AGENT                    Stopped

---------------------------------------------------------------------------

I have tried rebooting the apllication but no luck. Any advises please?

Thank you.