Jeff Kiesel wrote:
> So I think I have a better understanding of the OOO problem, and why
> ListServ setting won't stop it.
> 
> Outlook's autoresponder doesn't pay any attention to the Reply-To header.
> It responds to the From header.  So any OOO sent from an Outlook client,
> will never be sent to listserv, but right to the poster.
> 
> A different email client may have an autoresponder that uses the Reply-To
> header.  In this case the OOO will be sent to ListServ, and this is why we
> need to provide for OOO messages in CONTENT_FILTER.

Aaargh! 

Most of the OOOs are coming from Exchange.

Turn them off!

Location:
HKLM\System\CurrentControlSet\Services\MSExchangeIS\ParametersSystem
Value: SuppressOOFsToDistributionLists
Type: REG_DWORD
Value Data: 1

Jeff