I can't forward any email. or compose any email and send it out. I can reply and that works. What do I do?

Sounds like you are using the new mail, click switch to mail classic (small blue words) at the top of your mail screen, or use one of these links and click yes to opt out: http://us.mg1.mail.yahoo.com/dc/optout?s http://uk.mg1.mail.yahoo.com/dc/optout?s or this one: http://ymailupdates.com/blog/?p=76