I have the same problem.  K3zj@arrl.net is aliased to my gmail account, and is not working.  However, k3zj@arrl.org, aliased to my Microsoft office email, does appear to be working.

 

David Siddall

 

From: Microsoft Outlook <MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@NETORG3740845.onmicrosoft.com>
Date: Monday, April 18, 2022 at 5:24 PM
To: "k3zj@arrl.net" <k3zj@arrl.net>
Subject: Undeliverable: test

 

Image removed by sender.

Your message to k3zj@arrl.net couldn't be delivered.

k3zj wasn't found at arrl.net.

david

Office 365

k3zj

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 5.1.1 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 5.1.1

This error occurs because the sender sent a message to an email address outside of 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.

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 550 5.1.1 in Office 365.

Original Message Details

Created Date:

4/18/2022 9:24:27 PM

Sender Address:

david@davidsiddall-law.com

Recipient Address:

k3zj@arrl.net

Subject:

test


Error Details

Reported error:

550 5.1.1 <k3zj@arrl.net>: Recipient address rejected: User unknown

DSN generated by:

SJ0PR07MB8709.namprd07.prod.outlook.com

 

Message Hops

HOP

TIME (UTC)

FROM

TO

WITH

RELAY TIME

1

4/18/2022
9:24:28 PM

BL0PR07MB5650.namprd07.prod.outlook.com

BL0PR07MB5650.namprd07.prod.outlook.com

mapi

1 sec

2

4/18/2022
9:24:28 PM

BL0PR07MB5650.namprd07.prod.outlook.com

SJ0PR07MB8709.namprd07.prod.outlook.com

Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384)

*

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 by SJ0PR07MB8709.namprd07.prod.outlook.com (2603:10b6:a03:376::14) with
 Microsoft SMTP Server (version=TLS1_2,
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 ([fe80::84c0:9d80:b393:9f6e]) by BL0PR07MB5650.namprd07.prod.outlook.com
 ([fe80::84c0:9d80:b393:9f6e%5]) with mapi id 15.20.5164.025; Mon, 18 Apr 2022
 21:24:28 +0000
From: david davidsiddall-law.com <david@davidsiddall-law.com>
To: "k3zj@arrl.net" <k3zj@arrl.net>
Subject: test
Thread-Topic: test
Thread-Index: AQHYU2qvV9ZkPPHeCkax8PK4uDEr/g==
Date: Mon, 18 Apr 2022 21:24:27 +0000
Message-ID: <8A408BFB-EA01-4C51-8EF1-E4E3C6365946@davidsiddall-law.com>
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