It's a bug, caused by a new feature which, in the hope of saving network bandwidth, made DISTRIBUTEd list put up to 5 recipients for the same node per outbound file, in much the same way as non-DISTRIBUTEd lists do. It's difficult to fix, and in addition it can be fixed only by applying an update on both the source and sending node, because the source node (the one with the list) is the only one to know about the concealment, and the sending node (the one which actually generates the mail file) needs to be told about it and act appropriately. This means I need to find a way to pass this information in the DISTRIBUTE job while remaining upwards compatible. That requires time. I have very little time to spend on LISTSERV these days, because the LEP is going to start very soon and people are getting frantic about all the things they realize are not going to be ready in time. The best solution is probably to remove the new feature altogether and revert to the previous behaviour. Eric