They may simply be a person with some experience on LISTSERV(tm) hosted lists, and have their preferences for how they like to do things. More important to your situation, I think, is based on other information you have about the prospective subscriber- do they "belong" in the audience your list is intended for? I wouldn't use their apparent technical familiarity with the software product as a basis for judgement. Many people have acquired a fondness for CONCEAL from the times when list "harvesting" was often done and used to populate spam databases. These days most every list owner uses Review=Owner (as already mentioned by Rich) to prevent the harvesting and make the use of Conceal irrelevant - but old habits often linger. I can't read much psychology from the choice of header style, and the noack/norepro just means that if they should post to the list, they don't want a confirmation of distribution, or a copy of their own message.... not much psychology there either. Since you describe your list as announcement-oriented, Default-options=review or nopost may already be in place... or if you're concerned this prospective subscriber might be disruptive, you can quietly set review or nopost on them once they are subscribed. >>> [log in to unmask] 9/20/2006 12:22:48 PM >>> One of the lists for which I am a moderator received an unusual request to join today, and I wondered if anyone here had any ideas on whether it sounds off to them (I am a real Listserv newbie, just learning my way around). Normally, people who join our lists don't make special requests, but this person made the following settings requests: FULLHDR, NOACK, NOREPRO, CONCEAL. So they want to see full headers, and they don't want any sort of acknowledgment sent to them regarding any messages they send, and they don't want their presence to be revealed to the other members (although owners can always see who is subscribed, of course). What's odd about this is that our list is pretty exclusively an announcements-only list -- in other words, people who belong to the list don't post (although they can) and the only posts to the list are by the owners sending out information about upcoming events or news items. I'd appreciate any feedback from the lot of experts here on whether we should approve this request or not. J