当我在 Microsoft Teams 中撰写聊天消息时，接收者会在其 Office 365 帐户中收到一封电子邮件通知（[电子邮件保护])，当她在 Teams 中处于离线状态时。接收者设置了此功能，以便所有邮件都转发到她的个人 Gmail 帐户（[电子邮件保护])。对于发送至[电子邮件保护]这按预期工作。但所有 Teams 通知都被标记为垃圾邮件。Google 表示 DMARC 失败（见下文）。
我们有一个自定义 DNS 服务器，其中包含以下 TXT 记录：
Google 显示收到的邮件的以下详细信息：
消息来源如下：
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
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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
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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
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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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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
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To: [email protected]
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为什么邮件无法通过 DMARC 检查？这个问题我可以解决吗（例如在我们的 DNS 服务器中添加另一个条目）还是微软的错？我不认为这是谷歌的错，因为我也尝试转发到 iCloud 帐户，但该帐户完全拒绝了该邮件。
答案1
我认为微软的签名被破坏是他们的错。标头清楚地表明，在转发之前签名是有效的，但在 Google 收到后签名被破坏。检查签名的标头，有一个问题很突出：
发件人：日期：主题：消息 ID：内容类型：MIME 版本：X-MS-Exchange-SenderADCheck
X-MS-Exchange-SenderADCheck请检查提交邮件时的值（例如，非转发收件人收到的类似邮件）。
如果我是正确的，并且微软在转发时更改了该特定标头，这会在将其交给 Google 之前破坏其原始 DKIM 签名，然后查阅 o365/exchange 文档或向微软询问该字段的用途以及在转发签名邮件之前更改它的原因。