If you’d like to remove yourself from a Google Group, do any one of the following steps:
Reply to an email from the group with REMOVE ME as the subject of your message.
Send an email to groupname+unsubscribe@googlegroups.com. For example, if you want to leave the group myfriends@googlegroups.com, you could remove yourself by sending a blank email to myfriends+unsubscribe@googlegroups.com.
Go to the Group’s homepage and remove yourself as a member. (Please note that you’ll need a Google Account to unsubscribe yourself from this group through this method. You can easily create a Google Account, but if you would prefer not to create an account, you should use one of the other unsubscribe methods.)
Go to the group’s homepage. (Hint: If the group’s email address is example@googlegroups.com, then the URL for the group will be http://groups.google.com/group/example.)
Click Edit my membership.
At the bottom, click Unsubscribe.
Please note that if you unsubscribe from a group that only allows members to see group content, you might not be able to read that group's pages anymore. If you want to continue your membership in a group but don't want to receive group email, select the No Email option on the Edit My Membership page, then click "Save these settings".