strange hotmail problem

ok i have 2 customers telling me that every now and then when trying to send a email from hotmail to my server they get the following error message:

>From: postmaster@mail.hotmail.com
>To: *******@hotmail.com
>Subject: Delivery Status Notification (Failure)
>Date: Wed, 28 Aug 2002 10:41:31 -0700
>
>This is an automatically generated Delivery Status Notification.
>
>Delivery to the following recipients failed.
>
> *****@users-domain.com
>
>
>

and this message is also attached:

Reporting-MTA: dns;hotmail.com
Received-From-MTA: dns;mail.hotmail.com
Arrival-Date: Wed, 28 Aug 2002 10:41:28 -0700

Final-Recipient: rfc822;*****@users-domain.com
Action: failed
Status: 5.0.0



Any clues on why hotmail might be giving these errors?

 

 

 

 

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