Return-Path: <>
Received: from mx.helpdesk.example.com by mx.helpdesk.example.com; Wed, 23 Sep 2026 10:00:05 +0000
Date: Wed, 23 Sep 2026 10:00:05 +0000
From: Mail Delivery System <MAILER-DAEMON@mx.helpdesk.example.com>
To: support@helpdesk.example.com
Subject: Undelivered Mail Returned to Sender
Auto-Submitted: auto-replied
Message-Id: <20260923100005.DSN01@mx.helpdesk.example.com>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
	boundary="DSN01.1758621605/mx.helpdesk.example.com"

This is a MIME-encapsulated message.

--DSN01.1758621605/mx.helpdesk.example.com
Content-Description: Notification
Content-Type: text/plain; charset=us-ascii

This is the mail system at host mx.helpdesk.example.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients.

<nobody@gone.example>: host mx.gone.example[198.51.100.7] said: 550 5.1.1
    <nobody@gone.example>: Recipient address rejected: User unknown

--DSN01.1758621605/mx.helpdesk.example.com
Content-Description: Delivery report
Content-Type: message/delivery-status

Reporting-MTA: dns; mx.helpdesk.example.com
Arrival-Date: Wed, 23 Sep 2026 10:00:01 +0000

Final-Recipient: rfc822; nobody@gone.example
Action: failed
Status: 5.1.1
Diagnostic-Code: smtp; 550 5.1.1 <nobody@gone.example>: Recipient address rejected: User unknown

--DSN01.1758621605/mx.helpdesk.example.com
Content-Description: Undelivered Message Headers
Content-Type: text/rfc822-headers

From: Helpdesk <support@helpdesk.example.com>
To: nobody@gone.example
Subject: [#1004] Your request was received
Message-ID: <hd.1004.ee55@helpdesk.example.com>

--DSN01.1758621605/mx.helpdesk.example.com--