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Mail from Teams forwarded to Gmail marked as spam due to DMARC failure

lá cờ cn

When I write a chat message in Microsoft Teams the receiver gets an e-mail notification on her Office 365 account ([email protected]) when she is offline in Teams. The receiver set it up so that all her mails are forwarded to her personal Gmail account ([email protected]). For normal mails sent to [email protected] this works as expected. But all Teams notifications are marked as spam. Google says that DMARC fails (see below).

We have a custom DNS server with the following TXT records:

TXT records for htlvb.at

Google shows the following details for the received mail:

Google check result

And the following message source:

Delivered-To: [email protected]
Received: by 2002:a05:6102:22c6:0:0:0:0 with SMTP id a6csp126141vsh;
        Tue, 28 Sep 2021 20:57:32 -0700 (PDT)
X-Google-Smtp-Source: ABdhPJzoIoMngWwglBmEptt30Zo9LbSYdi+h60ylB7JYY70zFSXHQNhbDjrM0JhFd+XgdPAeZKJj
X-Received: by 2002:a92:ca4e:: with SMTP id q14mr3941013ilo.233.1632887852170;
        Tue, 28 Sep 2021 20:57:32 -0700 (PDT)
ARC-Seal: i=4; a=rsa-sha256; t=1632887852; cv=pass;
        d=google.com; s=arc-20160816;
        b=uZnSPh2our1xDKqBgznYVmLU4MHkWy+9WfIBcYxGbuAOiHypyYi2pU3yByqTWDxC3m
         XD8lQzitQmtWzWPozdJmWv6DFJW5eSVogISaSrA6i8qY2wBhk8ZlukHsKjWLlRTsWD/Q
         TJa+99FG/eIio0EDYtVW+2d+WlVN9qMei8Ap/aaA1snA27wHv91lUsAGLNI2kUUvwsMA
         omJAMvTBBCgGtEa6V8s4Z7nWhkGGpwwRnxaCefPwqBCZ8QMVy8zYmk/JGTVcSSTSQdQk
         bqWRkoJlrscnt3JLAA4WUpYdNcpORAi8WuuoXs+w6uxzNxfg2EpcvNWIOwBFvOm/WVVq
         FoUg==
ARC-Message-Signature: i=4; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=message-id:subject:date:to:from:mime-version
         :authentication-results-original:dkim-signature:resent-from
         :dkim-signature;
        bh=E55te+wP9yN3LiE6nhkfEQO75W71gJHR8kTe2/Df0Tw=;
        b=tD4Bp23ESAoj05NCp/jRzInE1sMlGqNZXOsi+nnUWfyER5TWbdIsKLsKelvGxJ7Hr9
         nFt6HHQPcLHU8rzXLLZPYxDpx4AawW5jYgM3JDKxYxyPYN5NNgBqiI2GL7Vfj5QyLDS8
         /+ABSoHsePowqp/x3y9RnTtmcv6XQAr8vZ0EoUMhr3udPI0Hi4z0orBjT9aHnfT9BDHK
         v0AX75QnZ8zZ16Y3yNCnYLj9xc9lJaZMwzZsE4zmddCI7d2GGvdXJXueJf/R29Ev+uPy
         Pcb2C4OnukH2eA4vPQ7HVvoyZiAlEyO79Ijb7mUkv697n+k+2N33g5GD5dz7bpPPKOP5
         VXvw==
ARC-Authentication-Results: i=4; mx.google.com;
       dkim=pass [email protected] header.s=selector2-htlvbat-onmicrosoft-com header.b=oGc7014X;
       dkim=fail [email protected] header.s=selector1 header.b=ljvyhPFv;
       arc=pass (i=3 spf=pass spfdomain=email.teams.microsoft.com dkim=pass dkdomain=email.teams.microsoft.com dmarc=pass fromdomain=email.teams.microsoft.com);
       spf=pass (google.com: domain of [email protected] designates 40.107.22.86 as permitted sender) [email protected];
       dmarc=fail (p=REJECT sp=REJECT dis=QUARANTINE) header.from=microsoft.com
Return-Path: <[email protected]>
Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05on2086.outbound.protection.outlook.com. [40.107.22.86])
        by mx.google.com with ESMTPS id d71si1114034jac.48.2021.09.28.20.57.31
        for <[email protected]>
        (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128);
        Tue, 28 Sep 2021 20:57:31 -0700 (PDT)
Received-SPF: pass (google.com: domain of [email protected] designates 40.107.22.86 as permitted sender) client-ip=40.107.22.86;
Authentication-Results: mx.google.com;
       dkim=pass [email protected] header.s=selector2-htlvbat-onmicrosoft-com header.b=oGc7014X;
       dkim=fail [email protected] header.s=selector1 header.b=ljvyhPFv;
       arc=pass (i=3 spf=pass spfdomain=email.teams.microsoft.com dkim=pass dkdomain=email.teams.microsoft.com dmarc=pass fromdomain=email.teams.microsoft.com);
       spf=pass (google.com: domain of [email protected] designates 40.107.22.86 as permitted sender) [email protected];
       dmarc=fail (p=REJECT sp=REJECT dis=QUARANTINE) header.from=microsoft.com
ARC-Seal: i=3; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=pass; b=b+84dTGQqJMxRJKr8rYlWitQtwVGW2kp+a6GE5F5iSIj0PYQPep5WRaZHRSogvC5ls4vqdRJy3jlh9c+Zrz/K79huChB6ukIfw7HARZlgA5CKId+HvDzIRuemRfA/mxIwTjagVz1jw4AmeR1TPAdcG53snUGO/mDuuA7Ys8RZGmXCmAJfABGfyHQb/intViZUCYqt/mQqjcOM5/OaAeJUfOwzq3ekqvBa31Tl5R4JBuSWrtOrlpwoiIUe4lFZLGKpltpal/78cnJ/0uZ7YduremGJQBsSLxgUEYgsyE6NzSNH0CBpPrhGtFVoFMf9ntav6WMvo9Y6qFX1ywNlB7eXg==
ARC-Message-Signature: i=3; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=E55te+wP9yN3LiE6nhkfEQO75W71gJHR8kTe2/Df0Tw=; b=SYnqBFHFzvqDK90FmxKlOYC0bYq2uYl6B+mdZl24zrxgHOoEnLca8n1ITM/+M6eq0yXOzpWJXSqHCUmA/FRm//MoIMs4ob/ItGcL3tF/2LSdAwAX87QQZRaolNUos6r/UTACzkgwq5J+bC20//qkCX9GT2Y+eT3fidJtd9keokM99Veh8eNz40fhF7pgoQJkY1HlPLSbuEddB6ubPEw4EvU96J8oFZrxIC8L74Yr1ffhya1e538snyRWhOLytaeJhcQbjX6mUMrAvYncQwURCcF2/8qxqOgumP+LFGg+ipa9SdXmrRlR4IYS9fqVwqW6MpRtlo64N+jLBk5yXqFn0g==
ARC-Authentication-Results: i=3; mx.microsoft.com 1; spf=pass (sender ip is 40.107.244.74) smtp.rcpttodomain=htlvb.at smtp.mailfrom=email.teams.microsoft.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=email.teams.microsoft.com; dkim=pass (signature was verified) header.d=email.teams.microsoft.com; arc=pass (0 oda=1 ltdi=1 spf=[1,1,smtp.mailfrom=email.teams.microsoft.com] dmarc=[1,1,header.from=email.teams.microsoft.com])
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=htlvbat.onmicrosoft.com; s=selector2-htlvbat-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=E55te+wP9yN3LiE6nhkfEQO75W71gJHR8kTe2/Df0Tw=; b=oGc7014X1+Xj25a1pciXq6R30XWnUOXIK7WKXpZYFhnL4qKYecdNRR6yOmNxGGyELGM+XJeDVbNkDK8ovcUq5xImeR0MhRB0eaoBeJ8ym+YkNQp+uH+V1NSh6kJr1gJPPg+d5NTYKNWTjKivjEJhsa26KW1FLDU5zaCjWPTHJ5E=
Resent-From: <[email protected]>
ARC-Seal: i=2; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=pass; b=dvpLCi52bG/QTgI6BkP3kkpbW1QbZrV2Q0/PAuSCC/7mGLhLSrDte8Pm8+sdw+UU1Vl7aM+UoIhpIh+9jBC/G7Sy8VPBPqINbCTm7oLwBbmsNuW69HtCTW2wO/B6W/AUpEZFsnnnLWBJNV2LIF1i8oD5fonJzMW9zSPNFuKPlLtEoDuNG9TLs5wd+bd8fX0nmdz97c2Gx6l8DN6/8ixg/cMP4U47bB/mrtTe1sJXzpqCVmbLjk/ntvDyy8PMJfcY/ppg301HuYLglAniO85mxyKgwR1af0EEHbkJ5dV/CBpxFzDcGqaYXmVUUarILtWzl6gjN4yw57T9wo+X3tultA==
ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=E55te+wP9yN3LiE6nhkfEQO75W71gJHR8kTe2/Df0Tw=; b=GaDbstOQWFP9Prnc3xX3BRtSNw7Z/gKFUdSmcJDF22BtGftNV+PfSUWPf+BuC8Hcxe9DlC0aI+V2RxBb2WCaf8WDg+QrJq+1KtbwLLKhmbK8iGc+QZ+0WPHieEskSVy5X0u4UIkCFvM4DCHKKlfZNU9yCFXplHC5HxCPtS9sGPCCjbeExQ0V0fL6EYjI6OjKcIif9V8Kf17HJhpEBtj4LWATbCH8b+V/1Uo9K/9jGJmVcdfpFYgaCeLiskG4ts70VRtztj+4Z8Lg/pKKKhg2rWbzfz6Qa9V+0XRLRns+Q59N3VxQ1DP400nHy0FmU/Cg6SbuH2oMyfRaLOe2DZob1w==
ARC-Authentication-Results: i=2; mx.microsoft.com 1; spf=pass (sender ip is 40.107.244.74) smtp.rcpttodomain=htlvb.at smtp.mailfrom=email.teams.microsoft.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=email.teams.microsoft.com; dkim=pass (signature was verified) header.d=email.teams.microsoft.com; arc=pass (0 oda=1 ltdi=1 spf=[1,1,smtp.mailfrom=email.teams.microsoft.com] dmarc=[1,1,header.from=email.teams.microsoft.com])
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Authentication-Results: spf=pass (sender IP is 40.107.244.74) smtp.mailfrom=email.teams.microsoft.com; htlvb.at; dkim=pass (signature was verified) header.d=email.teams.microsoft.com;htlvb.at; dmarc=pass action=none header.from=email.teams.microsoft.com;
Received-SPF: Pass (protection.outlook.com: domain of email.teams.microsoft.com designates 40.107.244.74 as permitted sender) receiver=protection.outlook.com; client-ip=40.107.244.74; helo=NAM12-MW2-obe.outbound.protection.outlook.com;
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ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=RscPHkD9NUWEZDU6mMlRUlnrkr10VueiAbO5UCtKQESHJGV8/MXj7WUe3MTz4TTZ85CG0fPo7A6xegE85fEiCo7OeW1MExWfcaiOI3D/TVx3kxN4eCQ8jZDHpvM8Wj/6TBMqv0QT8l1v/Pj0DyEuNUktExRfWdCLnBMommkZSAVc11Pr0RuLt+NOpNnv7GHiZKyYW04RxiwaWLaDQlg8VCMtSrjDqVr9sT9MiihEhRrrlwkuU08OWHRRUSFQvL7robHFWJfmWsWBcuBrK2/SQPmCcsgvd8qyX8JDYrh/OSBf2AfXYNjGP4FKFffWDg14LOaJ/JtxwOSu8kw+xZtz8g==
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; bh=E55te+wP9yN3LiE6nhkfEQO75W71gJHR8kTe2/Df0Tw=; b=GAACYoHRtSgpZSnvtRg/AqWzgagFvrGsAdZYP2lTwLjksAtr2HU6+xsL8/6ot/8TPYxHFMnIm6ZECCy97dcRi3WMzP61ZK8sgrnpgmSrdYs5nHXn5Ss1+wAE+Y3r31IKjQl+JXjdMXBbq3q/L+TCZg5b5XAdPG4zN2ZqIwkx+RCtJ254eI1J0amt+mnU5/kubHr1SpnGFOOH9UNCCGCvlkUEqXBHjHPwTUXXf7hA8v8c7bBifaoBwEqsxbzj8hlRkXm5588xLoYDiFCYVSP3CDX2nKw4EgrQzQZhs4RNMBUioHbNthecNr54f6BTKG0ZdyyLJA73uUZGABErIqwcAw==
ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 52.169.9.119) smtp.rcpttodomain=htlvb.at smtp.mailfrom=email.teams.microsoft.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=email.teams.microsoft.com; dkim=none (message not signed); arc=none
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=email.teams.microsoft.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=E55te+wP9yN3LiE6nhkfEQO75W71gJHR8kTe2/Df0Tw=; b=ljvyhPFvTOVOMZ8FnU0+gaKZ584PM1fgE/iFYRhdSuxqweo1cjiyQB7WKIxAByvytt49b4SeCGLs234qzjqNtNtoE2O/2KdDhcQYcWJJ1fNT7zhdKMo1dtMyxXshOPtz6IyibKjQl/qXDgMO1pWp70J7M/UK57ZhK4HxiNPBa0s=
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Authentication-Results-Original: spf=pass (sender IP is 52.169.9.119) smtp.mailfrom=email.teams.microsoft.com; htlvb.at; dkim=none (message not signed) header.d=none;htlvb.at; dmarc=pass action=none header.from=email.teams.microsoft.com;
Received-SPF: Pass (protection.outlook.com: domain of email.teams.microsoft.com designates 52.169.9.119 as permitted sender) receiver=protection.outlook.com; client-ip=52.169.9.119; helo=RD2818788C64D3;
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MIME-Version: 1.0
From: Teamsuser in Teams <[email protected]>
To: [email protected]
Date: 29 Sep 2021 03:57:20 +0000
Subject: Teamsuser sent a message
Content-Type: multipart/related; type="text/html"; boundary=--boundary_1532582_b1ce148d-f829-4e2c-bdd5-7c28f0654e00
Message-ID: <[email protected]>
Return-Path: [email protected]
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X-MS-Exchange-CrossTenant-Network-Message-Id: f530b62b-f065-4402-534b-08d982fd3f5e
X-MS-Exchange-CrossTenant-Id: 81de7086-f6b3-4e4b-9faf-18d4a406e66d
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... body truncated ...

The receiver not only forwards the mail, but she also keeps the original message in her Office 365 mailbox. Here are the headers of the same mail:

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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
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 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4566.14 via Frontend
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Authentication-Results-Original: spf=pass (sender IP is 52.169.9.119)
 smtp.mailfrom=email.teams.microsoft.com; htlvb.at; dkim=none (message not
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Received-SPF: Pass (protection.outlook.com: domain of
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MIME-Version: 1.0
From: "=?utf-8?B?el90ZXN0c2NodWVsZXIgel90ZXN0c2NodWVsZXIgaW4gVGVhbXM=?="
 <[email protected]>
To: [email protected]
Date: 29 Sep 2021 03:57:20 +0000
Subject: =?utf-8?B?el90ZXN0c2NodWVsZXIgc2VudCBhIG1lc3NhZ2U=?=
Content-Type: multipart/related; type="text/html";
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Message-ID:
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Return-Path: [email protected]
X-EOPAttributedMessage: 1
X-MS-PublicTrafficType: Email
X-MS-Office365-Filtering-Correlation-Id: f530b62b-f065-4402-534b-08d982fd3f5e
X-MS-TrafficTypeDiagnostic: BN6PR2001MB1028:|HE1PR0101MB2284:
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X-MS-Oob-TLC-OOBClassifiers: OLM:741;OLM:741;
X-MS-Exchange-SenderADCheck: 1
X-MS-Exchange-AntiSpam-Relay: 0
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X-Microsoft-Antispam-Message-Info: ... omitted because of a serverfault limit ...

Why does the message fail the DMARC check? Is this a problem I can fix (e.g. with another entry in our DNS server) or is this Microsoft's fault? I don't think it's Google's fault because I also tried forwarding to an iCloud account which rejects the message entirely.

anx avatar
lá cờ fr
anx
Tôi sẽ không cho rằng việc kiểm tra DMARC và phân loại thư rác có liên quan với nhau. Google hoàn toàn có khả năng nhận ra chuyển tiếp từ Microsoft, nhưng các quyết định ham/spam của họ vẫn sẽ xem xét chất lượng trung bình của khối lượng gửi đến từ `*.protection.outlook.com`.
Johannes Egger avatar
lá cờ cn
Được rồi cảm ơn. Đây là tôi ngắn mạch. Thư từ chối mà tôi nhận được từ iCloud nói điều gì đó về xác thực SPF, vì vậy tôi cho rằng nó liên quan đến SPF/DKIM/DMARC mà không cần biết quá nhiều về các kỹ thuật chống thư rác nói chung.
anx avatar
lá cờ fr
anx
Biện minh chính cho quyết định của Google bỏ qua hướng dẫn của người gửi để `từ chối` (trong khi vẫn áp dụng phân loại thư rác/ham) là "Nó có được người gửi xác thực không?" và "Đó có phải là thư không mong muốn cho người nhận không?" là hai câu hỏi không liên quan đến nhau, nhưng vẫn không giống nhau.
sebix avatar
lá cờ ie
Bạn có SRS tại chỗ?
anx avatar
lá cờ fr
anx
@sebix bất kỳ sơ đồ viết lại phong bì nào sẽ hiển thị rõ ràng từ phần `smtp.mailfrom=` của tiêu đề ARC-A-R.
Điểm:9
lá cờ fr
anx

Tôi cho rằng đó là lỗi của Microsoft vì đã phá vỡ chữ ký của họ. Các tiêu đề nói rõ ràng rằng chữ ký là tốt trước khi chuyển tiếp và sau đó bị hỏng khi nhận bởi Google. Kiểm tra các tiêu đề đã ký, một tiêu đề xuất hiện:

Từ:Ngày:Chủ đề:ID tin nhắn:Loại nội dung:Phiên bản MIME:X-MS-Exchange-SenderADCheck

Vui lòng kiểm tra giá trị của X-MS-Exchange-SenderADCheck trên thư khi nó được gửi (ví dụ: trong một thư tương tự mà người nhận không chuyển tiếp nhận được).

Nếu tôi đúng và Microsoft đã thay đổi tiêu đề cụ thể đó khi chuyển tiếp, điều này phá vỡ chữ ký DKIM ban đầu của nó trước khi chuyển giao cho Google, thì hãy tham khảo tài liệu o365/exchange hoặc hỏi Microsoft về mục đích của trường này và lý do thay đổi nó trước khi chuyển tiếp thư đã ký.

Johannes Egger avatar
lá cờ cn
Chà, cú bắt tuyệt vời. Có vẻ như nó đã thay đổi tiêu đề từ 1 thành 0 (xem câu hỏi cập nhật). Vì vậy, đây là lý do cho việc kiểm tra DMARC không thành công và sau đó là phân loại thư rác có thể xảy ra (Google) hoặc từ chối (iCloud) tương ứng?
anx avatar
lá cờ fr
anx
*Một* lý do, đầy đủ nhưng không nhất thiết là *chỉ* một (đối sánh nhị phân/không đối sánh không cho phép kết luận ngoài lý do đó). Trong mọi trường hợp, tiền tố `X-MS-` cho thấy nó không phải là thứ mà tôi có thể đoán được ý nghĩa của nó, tại sao nó lại được ký ngay từ đầu và tại sao Microsoft lại phá vỡ chữ ký của chính họ đối với nó.
Johannes Egger avatar
lá cờ cn
Được rồi cảm ơn.Ngay cả khi điều này có thể không đủ để đưa nó ra khỏi thư mục thư rác, nó sẽ giúp tôi tiến thêm một bước. Tôi sẽ đăng một câu hỏi khác nếu đó không phải là bước cuối cùng.
lá cờ ec
@anx có lẽ nó có nghĩa là "chuyển tiếp thư đi đã xác minh rằng thư này được gửi bởi ai đó đã đăng nhập bằng tài khoản Active Directory khớp với địa chỉ gửi"
Johannes Egger avatar
lá cờ cn
@anx Tôi chỉ muốn cho bạn biết rằng bạn đã đúng trong mọi điều bạn nói. 1. Microsoft đã khắc phục sự cố bằng cách không thay đổi tiêu đề "X-MS-Exchange-SenderADCheck" khi chuyển tiếp thư. 2. Google vẫn phân loại thư là thư rác mặc dù mọi kiểm tra (SPF, DKIM, DMARC) hiện đều vượt qua. Tuy nhiên, iCloud hiện chấp nhận thông báo, đây thực sự là điều tôi muốn đạt được. Cảm ơn một lần nữa cho câu trả lời tuyệt vời của bạn.

Đăng câu trả lời

Hầu hết mọi người không hiểu rằng việc đặt nhiều câu hỏi sẽ mở ra cơ hội học hỏi và cải thiện mối quan hệ giữa các cá nhân. Ví dụ, trong các nghiên cứu của Alison, mặc dù mọi người có thể nhớ chính xác có bao nhiêu câu hỏi đã được đặt ra trong các cuộc trò chuyện của họ, nhưng họ không trực giác nhận ra mối liên hệ giữa câu hỏi và sự yêu thích. Qua bốn nghiên cứu, trong đó những người tham gia tự tham gia vào các cuộc trò chuyện hoặc đọc bản ghi lại các cuộc trò chuyện của người khác, mọi người có xu hướng không nhận ra rằng việc đặt câu hỏi sẽ ảnh hưởng—hoặc đã ảnh hưởng—mức độ thân thiện giữa những người đối thoại.