I would like to set up a TWO-WAY link, if possible, to a couple of list distributors that are NOT like BITNIC, NCSUVM, or FRECP11 list servers. These list servers makes no changes to the headers at all. It manages to get the mail to me WITHOUT my address being in the header anywhere. I must presume it takes SMTP directly. It is running on a UNIX system. The address of the list itself shows up where (AND IF) the sender put it in the header. I have seen it in the CC: field. Is there any hope that LISTSERV can be made to detect a loop, which is almost sure to exist. It cannot be made to rely on its own name being in the header anywhere. The only thing I can think of doing at the moment is to really set up 2 lists on LISTSERV, one to receive and re-distribute mail from the UNIX server, the other to be a point that passes mail on to that UNIX server. The effect is that ONE LIST will have addresses different on the SENDER: it sends out and the TO: that you send to it. I'd like to avoid that if possible.