>Most people know that if they move to a new address, they have to give a >Change of Address notice to the Post Office. What is happening here >however is the poepl haven't moved, but the Post Office decides to rename >their street, without telling them. I don't agree with this analogy. The reason why sys admins typically don't tell their users the address has changed, is that users can still _receive_ mail sent to the old address. So, admins can't imagine there would be any problem. They don't realize that for a mailing list the _outgoing_ address may be important. So, it's more like the Post Office printing a new return address on the back of your envelopes, not realizing some people use it to authenticate the sender. Talk of a stupid analogy :-) Nicolas