I have the same problem. K3zj@arrl.net<mailto:K3zj@arrl.net> is aliased to my gmail account, and is not working. However, k3zj@arrl.org<mailto: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<https://go.microsoft.com/fwlink/?LinkId=389363>, 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<https://go.microsoft.com/fwlink/?LinkId=525920>. ________________________________ 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<https://go.microsoft.com/fwlink/?LinkId=389363>. 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) * Original Message Headers ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Cic3bZ4hEJcPI3P7497glAWZ2jc5pW9ESpHtvoAe/kSL1A0OGr0YLfNsuO9kF4SJm2CGMtam5Mh9tFMauJU8nMwTExuU3cISPKaCJfIHQ+kZPuovjGzwg8dYuXQQMwnlbTpuK+d5TjWhtBDoF3pVtNCD3g6UgXgpRdw0R5I/l2eQKmtPL4VN1iIq8cWhfd8DUGX0jVeTxdw4wC+s8iQuMJdLL6+07ZjCTHqgKznzaerpjd/eOnNmOE0J81luz6jwGG82RrPb+FePJCtIQ0Zke8gah6aKWTd1SLNaG9qeQ+ACr7FpmkYZ6d26s1kaRQbAYfcvxs68qwgQVFj6yrnnnA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=aWe/tyIXfd5j+/A7zXRRk9Xk3SDPyDtbR1QXw9y4w6Y=; b=dfdi/G7uKjUxZ6ckT1I7GLBsK4j1xeh5sP4YBQaiC5adxtAA9qySCnsRFO5drq1eQi1dDMSxX0BSOTPdjIzfs/H7xNm0FDYzk7EuYgK91Y5g6Z9lFcTBnGebhK02M9OLtnZw4k8Pb65ncMlNlafSk8IDaGrmPM9bOZe2kfzGOebngsIBj3LVpUXvyjFIlx+NUd3p/MGW4udHPo7CoYwD2AFRBXBYbHxtFe8OdAAVG43GOEzat/ivIc5Mt/Zu0LXjwOPnNpIF3SWiF7JG+NQpBebflvOvhE2mafU0D3icx1jJfiHByxx8wtdflpBvo5xm/m9UTYnU1vyRUKy54EycGw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=davidsiddall-law.com; dmarc=pass action=none header.from=davidsiddall-law.com; dkim=pass header.d=davidsiddall-law.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=NETORG3740845.onmicrosoft.com; s=selector2-NETORG3740845-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=aWe/tyIXfd5j+/A7zXRRk9Xk3SDPyDtbR1QXw9y4w6Y=; b=rf6fzi5QTTMe24M1GBajbd7KzoQHSuxWEj+ubAv69fZVPK7rPLM+yrOECKYJIxyt3G14dBxWTtzVSPjA4pH/75jXRmvCv/9hzOBovhvEcuWi2UVCGyXWfG1MIFG1MqcqwUmWEyTErx83QOK6ZUIjZeB/ikASBdUi/Ra/V13/ecE= Received: from BL0PR07MB5650.namprd07.prod.outlook.com (2603:10b6:208:8a::33) by SJ0PR07MB8709.namprd07.prod.outlook.com (2603:10b6:a03:376::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5164.18; Mon, 18 Apr 2022 21:24:28 +0000 Received: from BL0PR07MB5650.namprd07.prod.outlook.com ([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> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/16.56.21121100 authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=davidsiddall-law.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: d52128d3-2a5b-4152-48ca-08da2181d1d0 x-ms-traffictypediagnostic: SJ0PR07MB8709:EE_ x-microsoft-antispam-prvs: <SJ0PR07MB870931D5017D57E3652DE33C99F39@SJ0PR07MB8709.namprd07.prod.outlook.com> x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BL0PR07MB5650.namprd07.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(39830400003)(346002)(136003)(376002)(366004)(396003)(2906002)(26005)(186003)(2616005)(508600001)(6506007)(5660300002)(86362001)(122000001)(6512007)(8936002)(3480700007)(38070700005)(38100700002)(558084003)(33656002)(6486002)(66946007)(7116003)(64756008)(6916009)(8676002)(66476007)(66446008)(316002)(76116006)(36756003)(66556008)(71200400001)(45980500001)(220243001)(558944008);DIR:OUT;SFP:1102; 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