That is all the information needed by the system for unsubscribing you to the list. When you send the message, everyone who has subscribed to the list will receive the message. Since some mail systems don't include a mail address in the header, please include your mail address at the bottom of all messages. If the subject only concerns you and one recipient, send your mail directly to the recipient. Keep the emotional content of all messages positive, or at least neutral.
Personal attacks can result in loss of subscription privileges.
The archive server will respond with a list of instructions.