I am getting this error when sending emails. How do I get rid of this "permanent error"?

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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.

receiver@gmail.com, ERROR CODE :554 - 5.2.1 Too many failures for the recipient



Reporting-MTA: dns; mx.zohomail.com
Arrival-Date: Mon, 09 May 2022 14:52:00 -0600

Original-Recipient: rfc822; receiver@gmail.com
Final-Recipient: rfc822; receiver@gmail.com
Status: 554
Action: failed
Last-Attempt-Date: 9 May 2022 20:52:04 GMT
Diagnostic-Code: 5.2.1 Too many failures for the recipient


Received:from mail.zoho.com by mx.zohomail.com
    with SMTP id xxxxxxxxxxxxxxxxxxxxx; Mon, 9 May 2022 13:52:00 -0700 (PDT)
Message-ID:<xxxxxxxxxxxxxxxxxxxxx@sender.com>
Date:Mon, 09 May 2022 14:52:00 -0600
From:Tech Intrigue <sender@sender.com>
To:"jharding86" <receiver@gmail.com>
Subject:My test
Content-Type:multipart/alternative;
    boundary="----=_Part_xxxxxxxxxxxxxxxx"
User-Agent:Zoho Mail