I do not understand why it is so common that people writes to a mailinglist and ask how to unsubscribe? If they were capable to subscribe, why are they not capable to read the footer in each mail:
ubuntu-users mailing list
Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-users
The exampel above is from the ubuntu user list but it is quite common on other lists too. Are you one of the people I talk about? Then check some mails from the list you want to unsubscribe for instructions before you ask/complain on the list.