On Apr 12, 2006, at 6:10 PM, Michelle Wilbers wrote:

> I understand what you are saying, but this problem occurs when *any*
> subscriber posts to the list, not just one. From what my  
> subscribers are
> reporting, this happens with every post to the list. I first  
> checked to be
> sure the list was not subscribed to itself. I also considered a  
> subscriber
> might have a forward setup that was sending list posts back to the  
> list
> address. But that would only explain one such incident, like your
> misconfigured header idea, and not how this happens with every  
> post, from
> every subscriber.
>
> The log entries I previously copied to this list were made by  
> different
> subscribers. I have a copy of the logs from that entire day, and  
> with every
> post, the duplicate error message was sent out. So, what the  
> subscribers are
> reporting is, in fact, occuring.
>
> Any ideas?

Yes, do what Pete Weiss said. The problem is most likely that one of  
the list's subscribers is reflecting its postings back to the list  
either because of a misconfiguration on the part of the subscriber or  
the subscriber's mail transport agent. This situation would impact  
all subscribers.