On Thu, 20 Jul 89 13:42:05 GMT Niall O'Reilly - EARN OSI Nwk Op Centre said: >Can anyone out there remind me why LISTSERV sets the SENDER field to >point to the list, please? It's not unknown for this to cause loops, >as RFC822 prescribes that error reports be directed to the address >given in the SENDER field. I am aware that LISTSERV has some heuristics >to filter "obvious" error reports, but that can only work for those >(categories of) reports already identified. It's to cut down on problems like the one Bill Sklar mentioned recently, where the non-delivery messages go back to the poster (who cannot do anything about them) instead of the list owner (who can). Now, that could be done by setting Sender: to some other address, such as that of the list owner or a special error mailbox, but neither carries the information that the mail is associated with the list (which some of us want to have). As I said to Bill offlist, the problem is that RFC822 never envisioned a system like LISTSERV, so LISTSERV has to make the best of a hostile environment. --Mark