Listowner manual v14.3 (7 Dec 2004), par. 4.9.2 "Passive Probing" describes a command: Auto-Delete= Yes,Full-Auto,Probe(30) ...but on putting the header, LISTSERV® reports an error: The following problems have been detected in the list header: * Auto-Delete= ...,YES,... Error: Invalid parameter value. Choose one from the following (without the quotes): "Semi-Auto", "Full-Auto", "Manual", "Delay(*)", "Max(*)" or "%Lite%Probe(*)". Please refer to the list keyword documentation (available via the "INFO KEYWORDS" command) for more information about keyword syntax. Did I misunderstand the manual instruction or what? Karl