unsubscribe

[Xinjiang Lu <xlv@emory.edu>]

I have already tried all methods that I know, it turns out that simply 
no way to sign off.
1. Go to http://www.debian.org/MailingLists/unsubscribe
2. email to debian-user-REQUEST@list.debian.org
3. email to listmaster@lists.debian.org

What's the problem with this mailing list?

Thanks for your help.

-Xinjiang