I have a request from a list owner to block vacation reply messages to the list. I told her that I have no control over auto-reply systems in other places, but I might be able to do something about our own. Can I? What I'm thinking would work would be to set up a regular expression filter, probably on the subject line but if an arbitrary header line could be used that would be better. Alternately, is there a specific header line that Listserv uses to recognize auto-replies that we could insert into our system? Any help appreciated. Thanks, - Mark -- Mark Berman, Director for Networks & Systems Williams College, OIT, Jesup Hall Williamstown, MA. 01267 413-597-2092