Someone in a yahoo group is spamming me with email to join their group. How do I report them or make them stop

sending invites is not something to report- block their e-mail or try these settings- which will stop invites from being sent to you How can I prevent moderators from adding me to their groups or sending me invitations? http://help.yahoo.com/l/us/yahoo/groups/original/members/email/email-44.html

You can prevent group owners from inviting you to join their groups and prevent them from Adding you to their groups without permission. Go to http://groups.yahoo.com/myprefs and sign in. Under Options on the right side, click on "Edit" for the email address you want to prevent Invites and Adds. Near top of page underneath "Group Invitations", remove the checkmarks in front of "Allow group moderators to invite me to their groups" and "Allow group moderators to directly add me to their groups". Click Save Changes.