You know you can private message someone on this site through their board name? Do you not have their screen name? Or is it that you do not want to use the message system here?
We no longer have the ability to look at a membership list alphabetically (I think that is what you are referring to?). However, if the person is not really active, you could do a search for that members posts through the search on this site, then click on the members name on the post to access their profile. Some members might have have listed their private email on their contact section, but I think most don't put personal info there.
Hope this answers your question although I know it wasn't helpful!!
Sharon