Messaging Gateway

I recieved few of these messages, can any body help me out to get rid of these messages.

Symantec Brightmail Gateway Alert Notification for.

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

The swap space utilization on the following hosts has reached the threshold (50%): 

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Host                     Swap used                Swap free                Date

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Local Host               2,121,384 KB (50%)       2,121,384 KB (50%)       Wed Feb 25 10:25:00 PKT 2009

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===========================================================================              

PLEASE DO NOT REPLY TO THIS MESSAGE. This email was sent from a                          

notification-only address that cannot accept incoming e-mail.

Hi,

You can alter the threshold on the Alert settings page.

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