Here is a sample of one of the headers.  I hope this helps track this problem down.

I can't positively confirm it, but it sure seems to happen mostly (if not all the time) to people whom the server failed to deliver a message to any time during the last month.

Thanks all....

* Collins Collectors List
*
* Owner= [log in to unmask],[log in to unmask]
* Notebook= Yes,A,Monthly,Public
* Digest= No
* Errors-to= [log in to unmask]
* Validate= YES,CONFIRM
* Auto-Delete= Yes
* Subscription= Open,Confirm
* Ack= Yes
* Confidential= No
* Notify= No
* Reply-to= Sender,Respect
* Review= OWNERS
* Send= PRIVATE
* Default-Options= NoFiles,REPro
*
* This list installed 01/04/97 by AI7R