The last two errors are because you're sending information in your controller. If you post that code, I'm sure someone can help you. I'm thinking (and this could be quite inaccurate since I can't see your controller code) that you have a redirect first or early in your controller?
I don't know if Ben has changed anything in his mail sending functions because it doesn't seem like there's a problem, at least from the code I've been using. Have you checked to make sure that GoDaddy has a mail server for you to use? I'm sure they do but as I said, with the mail sending functions not giving me a problem, just wondering what it could be on your end.