Newsgroups and Message-Id headers will assist with the NETNEWS interface of course, but they don't appear to help with the other problems. Files from this list appear on my reader as LSTSRV-L MAIL. This is because we are running the Mailer and it picks its fileid based on the SENDER: header. As Eric pointed out, changing this field to be the human to get transport messages will make it harder to detect mail from the lists. For me, this list would appear as MONTEIRO MAIL. Is this tolerable? I am currently porting 62 lists into Netnews here. I don't think this change would affect me very much but others might find it unacceptable.