Why can i not send or receive mail on my iphone anymore?

Hi, i use my iphone for my emails everyday but yesterday i went on my computer to send some mail and now i can't send or receive mail from my phone. I have tried all the help pages on yahoo but nothing seems to resole this, does anyone know what i need to do?

Connect your iPhone to iTunes and check the sync rate if that doesn't work go to setting delete the email account from your iPhone and then add it back that usually works

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