Yes, that happens a lot. It is either something un-parsable by LISTSERV, or something less important. For a while, I have seen trouble with 'From's like: From: [log in to unmask] Maybe that is the case again? If it is not their mailer causing the problem, which probably is the case, I suggest those users to use some other utility to prepare their messages (if they have something similar to NOTE, or whatever). -turgut