PERM_FAILURE: Message rejected for Sector 5 policy reasons

Hi,

When i send a mail in Gmail I saw the following error in my bounce back.

Can any one say me what is the error?

> From: mailer-daemon@googlemail.com
> To: rainsoft105@gmail.com
> Subject: Delivery Status Notification (Failure)
> Date: Fri, 26 Jan 2007 08:01:21 -0800
>
> This is an automatically generated Delivery Status Notification
>
> Delivery to the following recipient failed permanently:
>
> info@kmsshredding.com
>
> Technical details of permanent failure:
> PERM_FAILURE: Message rejected for Sector 5 policy reasons
>
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