MadEngineer:You probably know all this
Nope, no idea - you're talking to someone who used /bin/mail for email until forced at gunpoint into this Microsoft garbage (hey, if it was good enough for Ken and Dennis, it's good enough for me). Thanks for the explanation!
In terms of it being a config issue, it wouldn't surprise me if the mail monkeys thought it'd be a great idea to turn it on somewhere, but also that I'd probably have more luck asking the cat to fix it than them - after two to three years they still haven't managed to get mailing lists working properly, it takes weeks just to get a response to a ticket whereas the cat will at least meow and purr a bit as soon as it hears its name mentioned.