Some days ago, Stan (owner of HELP-NET) was asking about some mysterious mail bounces from the Netherlands. He had checked his subscriber list, but hadn't found anyone at the system from which the bounce messages originated. Well.........the problem subscribers are there, but they're a bit difficult to locate. The DNS (Domain Name Service) software allows a site/domain manager to specify a *lot* of information; it also allows a *very* customized setup. One of the resources available in DNS is the MX (Mail eXchanger) record; it allows the dynamic routing of email to a given hub system. For instance, email to anyone in my domain (engr.uky.edu) is directed to our mail hub system, d.ecc.engr.uky.edu, with an MX record. I pulled down the subscriber list to HELP-NET, extracted the addresses in the Netherlands, and asked the nameserver if any MX records existed for those domain addresses. Lo and behold: CARPEDM.HACKTIC.NL. 86337 MX 200 sun4nl.nluug.nl. CC.RUU.NL. 86337 MX 100 sun4nl.nluug.nl. GALILEO.NL. 345541 MX 100 sun4nl.nluug.nl. GWDCAF.DWG.RWS.NL. 345542 MX 100 sun4nl.nluug.nl. HELP-NET has subscribers in each of these domains; their email is routed, at times, through sun4nl.nluug.nl. Look to the postmasters at these sites for help. --Wes ps> If you have access to the TCP/IP Internet, you might want to play with 'dig' -- it's a public domain piece of software that lets you interrogate the nameservers for all kinds of useful information. If you have access to the Unix nslookup(1) com- mand, it will do the same things (but in a much more kludgy fashion)......