Cannot access incoming email server

Can logon now but inbox is still not receiving emails. Checked online as well. Its not receiving new mail.

I know that Yahoo email went down yesterday. After that, the Att servers began rejecting my password on my Mac Mail client. So I went to log in to my email through ATT's site as well as the myAtt/yahoo page. I was shocked to see that I apparently have NO emails. That's not true because people have been sending them to me, and I should have various bills in my inbox. I get email every single day. I'm done! Between the server problems, the vague billing, the overcharges on my bills, and long periods of explaining and reexplaining to customer support, I've had more than enough! Definitely not getting what I paid for since upgrading to Uverse. Should have switched to WOW when I moved! But I will have WOW out on Saturday. (insert favorite swear words here).