Thanks for all your assistance. I got the behaviour confirmed from different sources confirmed as a listserv problem. We are currently evaluating possibilies to upgrade. Meanwhile we switched the archive off and replaced it by a simple archive mailbox, that is subscribed to the the list. Anyway we need the archive only for documentary puposes. And, to pick up that thread of the discussion also, we will keep the list Send=public. Spam and viruses are an annoyance, but only that way we are reachable for everybody, what is an important objective. Oliver