ERROR CODE :550 - Relaying denied (#5.7.1)

ERROR CODE :550 - Relaying denied (#5.7.1)

HI, emails from out domain @cocimec.com, keep getting this error everytime we want to send emails, this started happending about 15 days ago, i need urgent help.

This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

d.leonor@cocimec.com, ERROR CODE :550 - Relaying denied (#5.7.1)



Reporting-MTA: dns; mx.zohomail.com
Arrival-Date: Mon, 12 Jul 2021 13:45:27 -0400

Original-Recipient: rfc822; d.leonor@cocimec.com
Final-Recipient: rfc822; d.leonor@cocimec.com
Status: 550
Action: failed
Last-Attempt-Date: 12 Jul 2021 17:45:32 GMT
Diagnostic-Code: Relaying denied (#5.7.1)


Received:from mail.zoho.com by mx.zohomail.com
    with SMTP id 1626111927719289.4873772165256; Mon, 12 Jul 2021 10:45:27 -0700 (PDT)
Message-ID:<17a9bd2e58b.ec826d9028330.6140996588874407198@cocimec.com>
Date:Mon, 12 Jul 2021 13:45:27 -0400
From:Daniel Enrique Leonor <d.enrique@cocimec.com>
To:"d.leonor" <d.leonor@cocimec.com>
Subject:test
Content-Type:multipart/alternative;
    boundary="----=_Part_89755_298459397.1626111927692"
User-Agent:Zoho Mail
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