When I did that on my Thunderbird (v2.0.0.4 for Linux) here, I got a new
message, with the message from the list attached to it, ready for
forwarding to any address I decide to type into the To file. IOW - NO
address whatsoever from the original email. On the Message menu, Ctrl-L
is the keystroke for "Forward".
Great if I wanted to forward the email to someone else. Worthless if I
want to reply to the list OR the original sender.