My iphone 5 has stopped sending email from my yahoo small business account email.?

I am receiving a new error message on an account that has been previously working. "Server does not allow relaying". This is only occurring on outgoing mail server for my yahoo account. I have made sure that all setting are the same on you outgoing mail on my computer. My computer setting is... show more I am receiving a new error message on an account that has been previously working. "Server does not allow relaying". This is only occurring on outgoing mail server for my yahoo account. I have made sure that all setting are the same on you outgoing mail on my computer. My computer setting is smtp.bizmail.yahoo.com. This has worked for years, now doesn't. However, the incoming mail works.
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