Do you have Ursula K Le Guins or Sheri Teppers (or another particular authors) email address?
No, I almost certainly don’t; and in those few instances where I might know an author personally, I don’t put anybody in touch with them, for any reason, whatsoever. Your best bet is to contact them through official channels: See if they have websites with a contact email address. Or try their publishers. In general, to contact an author, you contact their agent. This information can be found by using reference books like Contemporary Authors (found in most libraries). If you can’t find an agent, try sending it to the author c/o their publisher. If you’re trying to find their literary estate or contact for republishing something, also try WATCH (Writers, Artists, and Their Copyright Holders).