Gentlemen - Apologies for intruding in this manner, but I have a query for which the usual sources don't seem to have an answer. What is the collective wisdom on providing A records (for Internet access) but stopping mail access? There are a large number of machines here in University College Dublin which require Internet access but can't run a SMTP server (they're PC and the like). I want to ensure that anyone trying to send mail to them gets a prompt refusal -- what I plan to do to is provide a DNS entry like this: toaster.ucd.ie. IN A 137.43.2.29 toaster.ucd.ie. IN MX undeliverable.ucd.ie. The host undeliverable.ucd.ie doesn't exist, which should as far as I know return a prompt "can't deliver mail" message. So, is this how other people do it? Is this the right way? Is there a better way? Any and all suggestions will be gratefully received. - Arthur Green University College Dublin Computing Services Tel: +353 1 706 2456 Fax: +353 1 283 7077 E-mail: arthur@midir.ucd.ie