issue with sending outbound mail to yahoo

dirkdigs 921 Reputation points
2022-04-05T14:26:31.77+00:00

hi we have been unable to send mail to yahoo.com since implementing a dmarc record in our environment.

the non-deliverable we are getting back is the following :

Status code: 550 5.0.350

I opened a ticket with Microsoft support but they just told me it's a yahoo issue. I don't really have any way of contacting yahoo.

How can i resolve this ? Is there anything else i can do on my end?

Here is the original message header - any clues?

Original Message Headers  
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none;  
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ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com;  
 s=arcselector9901;  
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ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass  
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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=CONTOSO.COM;  
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Received: from QB1PR01MB2897.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c00:3f::12)  
 by YQBPR0101MB5541.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:45::21) with  
 Microsoft SMTP Server (version=TLS1_2,  
 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5123.31; Mon, 4 Apr  
 2022 16:08:13 +0000  
Received: from QB1PR01MB2897.CANPRD01.PROD.OUTLOOK.COM  
 ([fe80::285f:54f2:3048:bda4]) by QB1PR01MB2897.CANPRD01.PROD.OUTLOOK.COM  
 ([fe80::285f:54f2:3048:bda4%7]) with mapi id 15.20.5123.031; Mon, 4 Apr 2022  
 16:08:11 +0000  
From: username lastname <username.lastname@CONTOSO.COM>  
To: "username@yahoo.com" <username@yahoo.com>  
Subject: Test  
Thread-Topic: Test  
Thread-Index: AdhIPjTs2kdQe1SXRVSdjDoKvS/2og==  
Date: Mon, 4 Apr 2022 16:08:11 +0000  
Message-ID: <QB1PR01MB28975C398B1E087AD00E5D27DCE59@QB1PR01MB2897.CANPRD01.PROD.OUTLOOK.COM>  
Accept-Language: en-US  
Content-Language: en-US  
X-MS-Has-Attach: yes  
X-MS-TNEF-Correlator:  
authentication-results: dkim=none (message not signed)  
 header.d=none;dmarc=none action=none header.from=CONTOSO.COM;  
x-ms-publictraffictype: Email  
x-ms-office365-filtering-correlation-id: 3108ff54-05f7-45b7-b017-08da1655515f  
x-ms-traffictypediagnostic: YQBPR0101MB5541:EE_  
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x-ms-exchange-senderadcheck: 1  
x-ms-exchange-antispam-relay: 0  
x-microsoft-antispam: BCL:0;  
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x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:QB1PR01MB2897.CANPRD01.PROD.OUTLOOK.COM;PTR:;CAT:NONE;SFS:(13230001)(4636009)(366004)(396003)(346002)(39830400003)(376002)(136003)(33656002)(40140700001)(55016003)(86362001)(5660300002)(2906002)(7116003)(8676002)(52536014)(508600001)(64756008)(66446008)(66476007)(66556008)(66946007)(76116006)(38070700005)(8936002)(6916009)(316002)(558084003)(7696005)(3480700007)(26005)(186003)(99936003)(71200400001)(38100700002)(166002)(122000001)(9686003)(6506007);DIR:OUT;SFP:1102;  
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  1. Andy David - MVP 143.8K Reputation points MVP
    2022-04-05T16:41:39.03+00:00

    This started after you setup DMARC?

    Same issue if you set the p=quarantine instead of "None"?
    I wonder if Yahoo is being picky because None essentially means DMARC is not enabled.