Undelivered Mail Returned to Sender, ERROR_CODE :550

Undelivered Mail Returned to Sender, ERROR_CODE :550

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.

yoursite@email.com, ERROR CODE :550 - Requested action not taken: mailbox unavailable



Reporting-MTA: dns; mx.zohomail.in
Arrival-Date: Sat, 10 Jun 2023 08:22:01 +0000

Original-Recipient: rfc822; yoursite@email.com
Final-Recipient: rfc822; yoursite@email.com
Status: 550
Action: failed
Last-Attempt-Date: 10 Jun 2023 08:22:06 GMT
Diagnostic-Code: Requested action not taken: mailbox unavailable


Received:from naturestroke.com (ec2-3-109-147-240.ap-south-1.compute.amazonaws.com [3.109.147.240]) by mx.zoho.in
    with SMTPS id 1686385321941425.10313102081784; Sat, 10 Jun 2023 13:52:01 +0530 (IST)
Message-ID:<GnW4lobPA5YQGtEneytIK4vEQozki6dBwPgH8cWa17I@naturestroke.com>
Date:Sat, 10 Jun 2023 08:22:01 +0000
From:Mike Green <info@naturestroke.com>
To:yoursite@email.com
Subject:XTRA "AI Monthly SEO plans"
Content-Type:text/plain; charset=UTF-8


I keep getting the following bounced emails and error code. My SPF, DKIM and DMARC records are setup correctly. Please help me resolve this issue.