> Looked to me like it was sent to the entire list.
 > 
 > Now, if anyone replies to that email, I guess the entire list is going to
 > get a second copy of every single email :(
 > 
 > Maybe time to unsubscribe

As several folks figured out, someone messed up a subscription request
FOR amanda-users (rather than for thamselves) to majordomo AT amanda DOT org
resulting in that authorization message.  Apparently majordomo does not
check for this sort of thing and prevent it from happening.

Even if someone were to respond with the authorization message and
amanda-users were to get subscribed to itself, this wouldn't cause any
duplicate messages.  The setup on the server side is smart enough to
send a message once per subscriber and notice if a forwarding loop were
to happen and squash it. (an aside, if you managed to subscribe yourself
twice, you'll still get one copy of the message).

majordomo will set the To: field of a message correctly, so you can
check that to see who the message was destined for.

please ignore this and any other auth messages that may appear, and if
you happen to see a message indicating amanda-users was subscribed to
itself, you can either ignore it or contact postmaster AT amanda DOT org so
it can be removed (but even if it happens, you will NOT start seeing
multiple copies of the messages, and the removal is just part of keeping
things neat and tidy).

please direct any follow up to this message (if any) to
postmaster AT amanda DOT org.  Thanks.

-Todd
(list manager)