Hi, We use listserv for some distribution only, announcement type, functions. Some of these have very similar, if not identical, messages posted regularly and I'm getting some complaints about messages bouncing with the "duplicate" message. So the question is: how long does listserv remember the CRCs of messages and is that time tuneable? It would seem to me that for anti-looping purposes the system would only need to remember CRCs for a week or so. No? Thanks for any help, - Mark -- Mark Berman, Director for Networks & Systems Williams College, OIT, Jesup Hall Williamstown, MA. 01267 413-597-2092