Error Cannot Send Mail

To the community,
     Have message error which read in total as follows: " Cannot Send Mail" A copy has been placed in your Outbox. The recipient (the person e-mail address) was rejected by the server because it does not allow relaying."
How can I resolve this error?
Thanks

This is a phone upgrade 4s to 5s. Still have 4s same email accounts which works and same transfered to 5s.  I looked at 4s settings to mimic in 5s setup. Think a step or two is missing. The 4s send and receives emails with no problem. The 5s receives no problem just cannot reply or send email. Calling the email provider is not the problem. I can send and receive off laptops, other Iphones with no problems.  Do you have anymore suggestions?

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