Can't receive or send emails on my iphone?

Two weeks ago my phone all of a sudden stopped receiving or sending messages. My folders are still there but it keeps asking for my password and when I put it on just doesn't do anything. I have gone into my phone settings and put in the password but i just keep getting a message "yahoo server unavailable" On my account on my iphone for SMTP it says Yahoo SMTP Server which states is primary server. Don't know what to do, many thanks Sandra

Thats an iphone for you…

sorry, but you chose it!

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