Per section 4.3 of the List Owner's Manual (http://www.lsoft.com/manuals/ ownerindex.html), you simply take the flat file of addresses and surround it with the appropriate LISTSERV JOB commands, e.g., QUIET ADD listname DD=X IMPORT //X DD * user1 user2 etc., etc. /* Then you send this job to LISTSERV. Note that you should set Validate= No at least while sending this job. Nathan