A customer here wants to receive a "read receipt" when list subscribers have opened messages sent to the list. I know that it depends on the recipient's e-mail client sending a receipt, but I haven't been able to get this to work at all. I've experimented with different subscriber mail header options (FULLHDR, IETFHDR, etc.) to see if I could get Listserv to include the appropriate e-mail header to allow the feature to work, but with no luck. I'm wondering if anyone has successfully used read receipts with Listserv. Any information would be appreciated. Thanks, Scott Elder University of Houston