What's a good free proxy server site I can use with Yahoo! Mail?

None of the proxies I have run into will provide that* as a free service. They have very compelling reasons not to (such as abuse of their system, reading pages through a proxy won't come back to bite them but letting anonymous people send email could, so they usually aren't wiling to do it for free) so while it may exist somewhere I think you are barking up the wrong tree.

*SSL encrypted sites and mail.

There has to be at least one- you just probably never heard of one. I'll look around.

Rob, it's okay. I don't need one. I can access Yahoo! Mail Classic without a proxy server-I let Y!A know what the problem was-it was remedied. Thank you anyway.