Please explain why I am getting the following message:

This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 24 hours on the queue on manchester.micfo.com.

The message identifier is: 1G7aap-0006AA-8z
The subject of the message is: Today’s guest
The date of the message is: Mon, 31 Jul 2006 11:27:13 -0500

The address to which the message has not yet been delivered is:

Uptodate@KCUR.com

No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.

___________________________________________________________

Sometime a message cannot be delivered because there is an error in the person’s mailname or email address. In this situation the message will be returned to you. The returned message will be from Mail Delivery System and the subject will be Mail delivery failed: returning message to sender. In this situation you should check that you have correctly typed the address. The message will consist of your original message preceded by some explanatory test. In the example mail name ” Uptodate” is not a valid username.