Hi. My first post on this forum. I'm not sure what a 'Wild card' is on Yahoo. But it's the 'FROM' mail address you need to block, and not the 'RETURN PATH' mail address. You can get the relevant info from the 'more' and view 'raw message' option on the Yahoo mail page. If it's a persistent spammer, which it sounds as though it is. You'll find the 'From' mail address changes every time too.