How do I unsubscribe?

My email address has changed and I’m not able to unsubscribe from the list.
My old email address has changed to a new one, but all my email to the old
address is forwarded. When I try sending an email to
ruby-talk-ctl@ruby-lang.org or ruby-talk-admin@ruby-lang.org I get an
automated response that I’m not on the list (because the from address is
different). How do I get this address off the list???

Thanks,
Charles