It's as easy as subscribing - simply send a blank message to the unsubscribe address for that list. The unsubscribe address is shown along with the susbscribe addresses on the mailing lists pages - eg unsubscribe addresses for top-level lists are shown on the top-level lists page .
As an example, say you want to unsubscribe from the nbusers@netbeans.org list. As shown on the top-level lists page , the unsubscribe address is :
nbusers-unsubscribe@netbeans.org
If you are subscribed to the digest version (where you get all message in one email):
nbusers-digest-unsubscribe@netbeans.org
See also