How to unsubscribe this mail list?

tks.

Have a look at your own mail’s header:

X-ML-Info: If you have a question, send e-mail with the body “help”
(without quotes) to the address ruby-talk-ctl@ruby-lang.org;
help=mailto:ruby-talk-ctl@ruby-lang.org?body=help

Or how the webpage
http://www.ruby-lang.org/en/ml.html
reads:

To unsubscribe from a list, send a mail which body
is “unsubscribe” to the controller address.
<<<<< ^^^^^^^^^^

See: normally you never can use a list-address
itself for sending commands to the server.

HTH
Det