Your message to kclarke19@stokehigh.co.uk couldn't be delivered.
kclarke19 wasn't found at stokehigh.co.uk.
webmaster Office 365 kclarke19
Action Required Recipient
Unknown To address

How to Fix It
The address may be misspelled or may not exist. Try one or more of the following:
  • Send the message again following these steps: In Outlook, open this non-delivery report (NDR) and choose Send Again from the Report ribbon. In Outlook on the web, select this NDR, then select the link "To send this message again, click here." Then delete and retype the entire recipient address. If prompted with an Auto-Complete List suggestion don't select it. After typing the complete address, click Send.
  • Contact the recipient (by phone, for example) to check that the address exists and is correct.
  • The recipient may have set up email forwarding to an incorrect address. Ask them to check that any forwarding they've set up is working correctly.
  • Clear the recipient Auto-Complete List in Outlook or Outlook on the web by following the steps in this article: Fix email delivery issues for error code 5.1.10 in Office 365, and then send the message again. Retype the entire recipient address before selecting Send.
If the problem continues, forward this message to your email admin. If you're an email admin, refer to the More Info for Email Admins section below.

Was this helpful? Send feedback to Microsoft.

More Info for Email Admins
Status code: 550 5.1.10

This error occurs because the sender sent a message to an email address hosted by Office 365 but the address is incorrect or doesn't exist at the destination domain. The error is reported by the recipient domain's email server, but most often it must be fixed by the person who sent the message. If the steps in the How to Fix It section above don't fix the problem, and you're the email admin for the recipient, try one or more of the following:

The email address exists and is correct - Confirm that the recipient address exists, is correct, and is accepting messages.

Synchronize your directories - If you have a hybrid environment and are using directory synchronization make sure the recipient's email address is synced correctly in both Office 365 and in your on-premises directory.

Errant forwarding rule - Check for forwarding rules that aren't behaving as expected. Forwarding can be set up by an admin via mail flow rules or mailbox forwarding address settings, or by the recipient via the Inbox Rules feature.

Recipient has a valid license - Make sure the recipient has an Office 365 license assigned to them. The recipient's email admin can use the Office 365 admin center to assign a license (Users > Active Users > select the recipient > Assigned License > Edit).

Mail flow settings and MX records are not correct - Misconfigured mail flow or MX record settings can cause this error. Check your Office 365 mail flow settings to make sure your domain and any mail flow connectors are set up correctly. Also, work with your domain registrar to make sure the MX records for your domain are configured correctly.

For more information and additional tips to fix this issue, see Fix email delivery issues for error code 5.1.10 in Office 365.
Original Message Details
Created Date: 4/29/2021 11:45:30 AM
Sender Address: webmaster@inkscape.org
Recipient Address: kclarke19@stokehigh.co.uk
Subject: Your registration on inkscape.org

Error Details
Reported error: 550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient kclarke19@stokehigh.co.uk not found by SMTP address lookup
DSN generated by: PA4PR01MB7760.eurprd01.prod.exchangelabs.com

Message Hops
HOP TIME (UTC) FROM TO WITH RELAY TIME
1 4/29/2021
11:45:30 AM		 inkscape1.osuosl.org inkscape1.osuosl.org ESMTP *
2 4/29/2021
11:45:30 AM		 inkscape1.osuosl.org smtp2.osuosl.org ESMTP *
3 4/29/2021
11:45:30 AM		 smtp2.osuosl.org localhost ESMTP *
4 4/29/2021
11:45:31 AM		 localhost smtp2.osuosl.org ESMTP 1 sec
5 4/29/2021
11:45:33 AM		 smtp2.osuosl.org HE1EUR01FT031.mail.protection.outlook.com Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) 2 sec
6 4/29/2021
11:45:35 AM		 HE1EUR01FT031.eop-EUR01.prod.protection.outlook.com AM6P195CA0100.outlook.office365.com Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) 2 sec
7 4/29/2021
11:45:35 AM		 AM6P195CA0100.EURP195.PROD.OUTLOOK.COM PA4PR01MB7760.eurprd01.prod.exchangelabs.com Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) *

Original Message Headers

Received: from AM6P195CA0100.EURP195.PROD.OUTLOOK.COM (2603:10a6:209:86::41)
 by PA4PR01MB7760.eurprd01.prod.exchangelabs.com (2603:10a6:102:cc::20) with
 Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4065.23; Thu, 29 Apr
 2021 11:45:35 +0000
Received: from HE1EUR01FT031.eop-EUR01.prod.protection.outlook.com
 (2603:10a6:209:86:cafe::25) by AM6P195CA0100.outlook.office365.com
 (2603:10a6:209:86::41) with Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4087.27 via Frontend
 Transport; Thu, 29 Apr 2021 11:45:35 +0000
Authentication-Results: spf=pass (sender IP is 140.211.166.133)
 smtp.mailfrom=inkscape.org; stokehigh.co.uk; dkim=none (message not signed)
 header.d=none;stokehigh.co.uk; dmarc=bestguesspass action=none
 header.from=inkscape.org;
Received-SPF: Pass (protection.outlook.com: domain of inkscape.org designates
 140.211.166.133 as permitted sender) receiver=protection.outlook.com;
 client-ip=140.211.166.133; helo=smtp2.osuosl.org;
Received: from smtp2.osuosl.org (140.211.166.133) by
 HE1EUR01FT031.mail.protection.outlook.com (10.152.0.177) with Microsoft SMTP
 Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
 15.20.4065.21 via Frontend Transport; Thu, 29 Apr 2021 11:45:33 +0000
Received: from localhost (localhost [127.0.0.1])
	by smtp2.osuosl.org (Postfix) with ESMTP id 4F91740686
	for <kclarke19@stokehigh.co.uk>; Thu, 29 Apr 2021 11:45:31 +0000 (UTC)
X-Virus-Scanned: amavisd-new at osuosl.org
Received: from smtp2.osuosl.org ([127.0.0.1])
	by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024)
	with ESMTP id ye4s83T0QeDh for <kclarke19@stokehigh.co.uk>;
	Thu, 29 Apr 2021 11:45:30 +0000 (UTC)
Received: from inkscape1.osuosl.org (inkscape1.osuosl.org [140.211.9.79])
	by smtp2.osuosl.org (Postfix) with ESMTP id BB78940683
	for <kclarke19@stokehigh.co.uk>; Thu, 29 Apr 2021 11:45:30 +0000 (UTC)
Received: from inkscape1.osuosl.org (localhost [IPv6:::1])
	by inkscape1.osuosl.org (Postfix) with ESMTP id 821951B91
	for <kclarke19@stokehigh.co.uk>; Thu, 29 Apr 2021 11:45:30 +0000 (UTC)
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: Your registration on inkscape.org
From: webmaster@inkscape.org
To: kclarke19@stokehigh.co.uk
Date: Thu, 29 Apr 2021 11:45:30 -0000
Message-ID: <20210429114530.22913.38812@inkscape1.osuosl.org>
Return-Path: webmaster@inkscape.org
X-EOPAttributedMessage: 0
X-EOPTenantAttributedMessage: f7948c00-e0bd-4c90-bd68-f198833d07a5:0
X-MS-PublicTrafficType: Email
X-MS-Office365-Filtering-Correlation-Id: 72feaee3-019b-492e-b664-08d90b044c23
X-MS-TrafficTypeDiagnostic: PA4PR01MB7760: