On the Web:
1. Sign in to Yahoo! Groups and go to your group on the web.
2. From any page on the group, click the Edit Membership link at the top of the page.
3. Click the Leave Group link at the bottom right of the page.
4. Confirm on the next page.
The group will no longer be listed on the My Groups page, and you’ll no longer receive messages.
To leave/unsubscribe via email:
From your email program, send a blank message to:
Make sure to replace "groupname" with the actual name of the group (e.g., firstname.lastname@example.org...
Alternatively, you may wish to remain a member but reduce or eliminate group email by changing your message delivery option to No Mail/Web only, Daily Digest, or Special Announcement. From the "Edit Membership" Page, you can also change your email frequency settings to one of these options.
Note: If you own a group, you must first give up your ownership in the Members section of your group before you can leave on the My Groups page.