Can I find a yahoo group that a certain e-mail belongs to?

Question

I have an e-mail address and I trying to see if he belongs to any groups on yahoo. Is that possible?

Answer 1

if it's a closed group or not listed in the directory, you may not find it. otherwise, you'd enter the title of the group into the search of groups

http://groups.yahoo.com/

Answer 2

If it's an email address from an individual, just do a Yahoo web search for that email address. It's possible that he has posted on a Yahoo group using that addy and a search would pull it up along with the group name.  

You could also search Yahoo Member's Directory for the name on the email address (leave off the @isp.com).  That would be a  long shot but might work.  If all else fails, send him an email an ask him if he belongs to any Yahoo groups.