This might help:

(big round of applause to University of Iowa's ITS )
http://its.uiowa.edu/support/article/100804

List owners may receive an error message that reads:

>> The enclosed  message, found in  the listname mailbox and shown  under the spool ID xxxx  in the system log,  has been identified as  a possible delivery error notice for the following reason: "X-Report-Type:" field found in the mail header

 

The list owner should click on the attachment included with this message. The attachment will give them more information about the specific error.

The attachment may read:

This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed.
[log in to unmask]

In this example, the attachment tells the list owner that the message was unable to be delivered to the recipient. This could be because the subscriber is over quota or the address is no longer valid. If the list owner continues to receive this error message, it is best to remove the subscriber from the list.

This error message occurs when a message cannot be delivered to one or more recipients. The recipient's email address may be incorrect 

________________________________________
From: LISTSERV List Owners' Forum <[log in to unmask]> on behalf of Lai, Wen Pin <[log in to unmask]>
Sent: Thursday, June 30, 2016 3:08 PM
To: [log in to unmask]
Subject: Interpret the error message

Hi all

Can you anyone help explain the error message below:

The  enclosed message,  found in  the VA_PROVIDER_TOOLKIT-L  mailbox and
shown under the spool ID  20734 in the system log, has been  identified
as a possible delivery error notice for the following reason:
"X-Report-Type:" field found in the mail header.

Thanks,
Kevin


-----Original Message-----
From: Lai, Wen Pin
Sent: Thursday, June 30, 2016 12:00 PM
To: [log in to unmask]
Subject: Owner can't post a message

Hi

One of our listserv owners wanted to post her first message but was
rejected with the message that she was not authorized. What could be the
main issue? Can this be fixed in the settings?

Thanks,
Kevin

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