Mail not delivered

[email protected]
Newsgroups gmane.mail.spam.spamcop.help
Message-ID <OFB33B3F32.C4F663B0-ON8625708F.004E4A0F-8625708F.004F1EC1@sunstoneinc.com> 
We are having problems with a couple of our partners receiving the 
following message when sending email to our address.  How do we find out 
what's causing this delivery failure?

From: Mail Delivery System [mailto:[email protected]] 
Subject: Delivery Status Notification (Failure)

The following message to was undeliverable.
The reason for the problem:
5.4.7 - Delivery expired (message too old) ''

Steville Mims
[email protected]
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