The response from the remote server was: 550 5.7.1 Relaying denied

The response from the remote server was: 550 5.7.1 Relaying denied

when I am trying to send mail using Zoho mail the below error is showing can anyone help me in this..you can see it is showing mailgun dns

Message not delivered
Your message couldn't be delivered to hi@saveonbuy.com because the remote server is misconfigured. See technical details below for more information.

The response from the remote server was: 550 5.7.1 Relaying denied


Final-Recipient: rfc822;  hi@saveonbuy.com
Action: failed
Status: 5.7.1
Remote-MTA: dns;  mxa.mailgun.org . (35.167.16.139, the server for the domain  saveonbuy.com .)
Diagnostic-Code: smtp; 550 5.7.1 Relaying denied
Last-Attempt-Date: Fri, 26 May 2017 01:53:06 -0700 (PDT)


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