Visit LISTSERV.okstate.edu.

Sign in using the Log In button in the top right of the screen.

Once you’ve logged in, click Subscriptions on the left panel to view your subscribed lists.

From here, check the box beside each of the lists you want to unsubscribe from. Select Unsubscribe from the left most drop-down list and then click Update in the bottom right.

You are now removed from the list(s).