Here are the full headers from a new email. I've redacted the various domains and IP addresses but hopefully it all makes sense.
Received: from AM6EUR05HT027.eop-eur05.prod.protection.outlook.com (2603:10a6:10:2b0::12) by DB7P191MB0378.EURP191.PROD.OUTLOOK.COM with HTTPS via DU2PR04CA0157.EURPRD04.PROD.OUTLOOK.COM; Tue, 14 Sep 2021 07:13:02 +0000 ARC-Seal: i=2; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=fail; b=eb5egkxeCkJnvUpwA/HTQ6aYeCJfbfL3yRdCaAhD9aVMwhljOA6V9RhgWVkVHYRpf77BZvw4IztiAU8Y/sUAUAt7s3f77M4qZ37RzOIWktDkKknW8xFxsOQaJIOaxdWjE7L53F51JMmPlOIQ/RgvkIZyiN77GTCCoxhkayzZaL5O8Gc3Rop9kY90sBNRCi/B1DU1keJ45U+KBfnulEWGE3r2DJ9BrfI8WiQCYFIvR1Ryr0wY8uqQiWlitgbfprEl7mkDzR4x/tNUvowVDqltiedfrM3ML7+AHUW4PI2Ih78Uvv6T0+fZHVrRKCOyczU0S9RilRLxMlh+lEtr+Q9GGg== 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=jmWFlJwqirfiVtLi98SrRrGA3zfBLMBC8UI7ReTsiOc=; b=n07Rdb5JFtRW5a+UmP0zCEJLks5YOE8ZLI6tzNU37BgF8rsqXy2K+Mj5N5742DMymdKnUnYF99nUp79v9BxwQX7EUt7mCXOlzjo//yR8QzV5mhqBroHoisznRxs70HzISZFDCwzMKgL1/BM6jIMVKWry9aTIt2Ii8ofS/Unw7coGBPccNtALvjJ585UUt2cVfIWPjVgt/ZPJ3d/RRsiao5Ot/Myhzyo3rHpl4nZHoxFDeWWK5kZ1Gy+hUxIqZWz9UswzX8K+i9OshilBicia/q/0RHpUCg1vNQsEIQYMRsNTDmvh+moPz2SVDhgLgJ7UOVjSMaO87T2DTacvEykjBg== ARC-Authentication-Results: i=2; mx.microsoft.com 1; spf=pass (sender ip is 1.2.3.4) smtp.rcpttodomain=destination.org smtp.mailfrom=mmserver.org; dmarc=bestguesspass action=none header.from=mmserver.org; dkim=test (signature was verified) header.d=mmserver.org; dkim=fail (signature did not verify) header.d=sender.org; arc=fail (47) Received: from AM6EUR05FT022.eop-eur05.prod.protection.outlook.com (2a01:111:e400:fc11::4b) by AM6EUR05HT027.eop-eur05.prod.protection.outlook.com (2a01:111:e400:fc11::306) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4500.18; Tue, 14 Sep 2021 07:13:02 +0000 Authentication-Results: spf=pass (sender IP is 1.2.3.4) smtp.mailfrom=mmserver.org; destination.org; dkim=fail (signature did not verify) header.d=sender.org;destination.org; dmarc=bestguesspass action=none header.from=mmserver.org;compauth=pass reason=109 Received-SPF: Pass (protection.outlook.com: domain of mmserver.org designates 1.2.3.4 as permitted sender) receiver=protection.outlook.com; client-ip=1.2.3.4; helo=mmserver.org; Received: from mmserver.org (1.2.3.4) by AM6EUR05FT022.mail.protection.outlook.com (10.233.240.168) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4500.18 via Frontend Transport; Tue, 14 Sep 2021 07:13:01 +0000 X-IncomingTopHeaderMarker: OriginalChecksum:C027C4C73C859E8BC4DD2D6EB0A2AFC55128E8E6AB569058BEFA2927BD59B759;UpperCasedChecksum:69084D51601C2F94765803933A8A1E513A3CE3B72501EEBE615F8404D9524BF9;SizeAsReceived:5583;Count:36 Received: from ip-172-31-73-169.ec2.internal (localhost [127.0.0.1]) by mmserver.org (Postfix) with ESMTP id 1EB91BDF09 for <philip@destination.org>; Tue, 14 Sep 2021 07:13:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mmserver.org; s=mailman; t=1631603581; bh=jmWFlJwqirfiVtLi98SrRrGA3zfBLMBC8UI7ReTsiOc=; h=Date:To:Subject:List-Id:List-Archive:List-Help:List-Owner: List-Post:List-Subscribe:List-Unsubscribe:From:Reply-To:From; b=c1hpMtUIu4xFaJHhKlp9wvMuMchhYHt8jZhx7iR79DwnuFFRd/YbDd7AvspoQ4tkb ob4ZZRRsX8P0Aw3w2iOOEGVOu7cuJgeOCs3tyjFDb1yfo3GAsbvKeaRQPblbo6Oaob bUuo+5OY825Jdk2FoVAKrxqrkrC4q2OsFoVGFIAc= ARC-Seal: i=1; cv=none; a=rsa-sha256; d=mmserver.org; s=mailman; t=1631603580; b=MriwQYAoGLx6qYcQ3jvD1X6WZP2bfE7/esgXKfCV7gSfQcLpbd3iwiJVFBD+4TX3jfTcG tGL6iZ69TrW2A4QS9zn7j0WbZh0YuDea6OGe0SLqJz3vVsVQJXmiduZET4LVkZKWVOMsghR 2Bti7RMvNwok2WQzsKkOf+cXmUFDOcg= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=mmserver.org; s=mailman; t=1631603580; h=from : sender : reply-to : subject : date : message-id : to : cc : mime-version : content-type : content-transfer-encoding : content-id : content-description : resent-date : resent-from : resent-sender : resent-to : resent-cc : resent-message-id : in-reply-to : references : list-id : list-help : list-unsubscribe : list-subscribe : list-post : list-owner : list-archive; bh=3DIn1IpjU5aYg7foYX2PvB0NxFt3Yvxu7ufHWw90s3M=; b=fNNEcs1c31725Mfmd4md62MVMIRbGHfnDf3SHY+W5Yz+Cb5RTYJhCpoSA6VpFUSgeGEYT DsjJDpwSbXucdbc2ar1s2TcZpshXBtGb7XSxdJy3ZWpGJ+nZdX+OvBTz8OvtggE6W/W/+KH 41/BqNmfc1MKlWsJH+q0cdwChifyo2I= ARC-Authentication-Results: i=1; mmserver.org; dkim=pass header.d=sender.org header.i=@sender.org header.a=rsa-sha256 header.s=google header.b=xCTkYbMD; dkim-atps=neutral; arc=none; dmarc=pass (Used From Domain Record) header.from=sender.org policy.dmarc=none Authentication-Results-Original: mmserver.org; dkim=pass header.d=sender.org header.i=@sender.org header.a=rsa-sha256 header.s=google header.b=xCTkYbMD; dkim-atps=neutral; arc=none; dmarc=pass (Used From Domain Record) header.from=sender.org policy.dmarc=none Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) by mmserver.org (Postfix) with ESMTPS id 99732BDF09 for <test@mmserver.org>; Tue, 14 Sep 2021 07:12:58 +0000 (UTC) Received: by mail-pl1-f173.google.com with SMTP id n4so7551535plh.9 for <test@mmserver.org>; Tue, 14 Sep 2021 00:12:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sender.org; s=google; h=mime-version:from:date:message-id:subject:to; bh=3DIn1IpjU5aYg7foYX2PvB0NxFt3Yvxu7ufHWw90s3M=; b=xCTkYbMDUx+tagAdAlyZE+awc/wc1iCI/PWp0jeuJFDM23WMTGo24PJjUFfCV4DH5G fKko+n5wov5IKcBpjLvcmg2OGuOQPGAl1ATWtCbl+SgZD4LBWftNLVz3XxJq2IDxb3me WF+IHsh3nunXExR17sEQx12pbXPhGmmy3G8We7jrZOLVfX0oRZ8Y6QiY1ACetrQ/FlyZ /T4axvHlXsiceP6rr6HwvHdj8XN2NbjkXZF265tfc/l2EdVXyTJlnhxxuxXFGTcBIPN1 OZadmYo5Q8VCsg78leQDp8eBAATL9JwUmFUDhL2U8KCWKXCCQJ4qVKReEqJB4PK5l5hZ 4nmg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=3DIn1IpjU5aYg7foYX2PvB0NxFt3Yvxu7ufHWw90s3M=; b=4mwQclptSSJQVxNaNlxhXDyNREM5qDVMMr8a2AvZFBoVQ6k8z1B8bMkEZB5I32NRnR BNTQUy7XQ2rVx171IgoTC24RPcQvWAd0Eg9+1On7vaMG5bIsY90ED1oavJA5NQ2KVXXn vVLr7JcKg0fsuk/xoy9bzRCZ5D5nYGYE6dCPb20iTTInM2QaXQgpoCElv0PQ7N3lvLeL KXqrhDc9bMVqbYNmu7rIkdAI+N6iY0IB+mMF16GTSM6RlMOuthl1jEQP4QK/7ShupDIM DFWC4U1vdK0+LA5Ep0ajUzgRLAK0k6GqBa+MlOsTxaYCHfruFzVGMYLu+BGhvlK+auc0 J/SA== X-Gm-Message-State: AOAM530xf2FH9mmbMhx3lhbVy3KOURBUXCxFSudsrgoQ/IHguihpAlkq fdjxxPp3FZqmjlPEPCHf6YHBtWkKPAk7jmICOiu0mHBYPA28SvgG X-Google-Smtp-Source: ABdhPJx9DHXrQn1DY+0svX/d2C3cT/h78ckSVX6QV//8wP5/4oBzLKHy5TqrppqktHiH0uZ4L+MDNmPNm1KPNNzet1s= X-Received: by 2002:a17:90a:f192:: with SMTP id bv18mr472417pjb.134.1631603577579; Tue, 14 Sep 2021 00:12:57 -0700 (PDT) Date: Tue, 14 Sep 2021 08:12:48 +0100 Message-ID: <CAKTSSTiPRjknheqN7QbvEZAzscCyRePz4JvQB1fDa39xuShMSA@mail.gmail.com> To: test@mmserver.org Message-ID-Hash: ORMUWLHDNPOVZ24JYJ3PMESIUSRL7XCC X-Message-ID-Hash: ORMUWLHDNPOVZ24JYJ3PMESIUSRL7XCC X-MailFrom: philip.colmer@sender.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.4 Precedence: list Subject: [Test] How does your garden grow? List-Id: <test.mmserver.org> List-Help: <mailto:test-request@mmserver.org?subject=help> List-Owner: <mailto:test-owner@mmserver.org> List-Post: <mailto:test@mmserver.org> List-Subscribe: <mailto:test-join@mmserver.org> List-Unsubscribe: <mailto:test-leave@mmserver.org> From: Philip Colmer via Test <test@mmserver.org> Reply-To: Philip Colmer <philip.colmer@sender.org> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-IncomingHeaderCount: 36 Return-Path: test-bounces+philip=destination.org@mmserver.org X-MS-Exchange-Organization-ExpirationStartTime: 14 Sep 2021 07:13:01.9563 (UTC) X-MS-Exchange-Organization-ExpirationStartTimeReason: OriginalSubmit X-MS-Exchange-Organization-ExpirationInterval: 1:00:00:00.0000000 X-MS-Exchange-Organization-ExpirationIntervalReason: OriginalSubmit X-MS-Exchange-Organization-Network-Message-Id: 8da823d6-328d-433c-6822-08d9774f16e0 X-EOPAttributedMessage: 0 X-EOPTenantAttributedMessage: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa:0 X-MS-Exchange-Organization-MessageDirectionality: Incoming X-MS-PublicTrafficType: Email X-MS-Exchange-Organization-AuthSource: AM6EUR05FT022.eop-eur05.prod.protection.outlook.com X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-UserLastLogonTime: 9/14/2021 7:12:57 AM X-MS-Office365-Filtering-Correlation-Id: 8da823d6-328d-433c-6822-08d9774f16e0 X-MS-TrafficTypeDiagnostic: AM6EUR05HT027: X-MS-Exchange-EOPDirect: true X-Sender-IP: 1.2.3.4 X-SID-PRA: TEST@mmserver.org X-SID-Result: PASS X-MS-Exchange-Organization-PCL: 2 X-MS-Exchange-AtpMessageProperties: SA|SL X-MS-Exchange-Organization-SCL: 0 X-Microsoft-Antispam: BCL:0; X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Sep 2021 07:13:01.8683 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8da823d6-328d-433c-6822-08d9774f16e0 X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-AuthSource: AM6EUR05FT022.eop-eur05.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6EUR05HT027 X-MS-Exchange-Transport-EndToEndLatency: 00:00:00.9874238 X-MS-Exchange-Processed-By-BccFoldering: 15.20.4500.018 X-Microsoft-Antispam-Mailbox-Delivery: abwl:0;wl:0;pcwl:0;kl:0;iwl:0;ijl:0;dwl:0;dkl:0;rwl:0;ucf:0;jmr:0;ex:0;auth:1;dest:I;ENG:(5062000283)(90000117)(91040095)(91044021)(91045095)(9050020)(9060116)(9100336)(5061607266)(5061608174)(4900116)(2008001114)(2008000189)(4920091)(6250099)(4950132)(4990091); X-Message-Info: 5vMbyqxGkdefRiIkrqg4ZwpGLfyUyJn4v5cLoN5lKwXdusI/i41s1qBGsktqj/swtQInJ01+vhFDsyZNXWXqrj0a99+1or22N3ukmdiSyb1k1ptz10WM/SSCU9mbDX6xYzh1iipr2J9mGgoqib5s1JOfhLrVHogoibBIRTGVaeukc7ecTQyRj4ux3Nwhmt43YYWKeqDG4XgX8obB2vWFqw== X-Message-Delivery: Vj0xLjE7dXM9MDtsPTA7YT0wO0Q9MTtHRD0yO1NDTD0tMQ== X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?g0Qa183Yfq7SY4i7wKx716EEM1w+IyCwbRK9aOFS0Ep+WmpHoOy5Mq966RH7?= =?us-ascii?Q?9RGYWFY1IfZ2w0/ytYgAPbgXGg5okckkKLB3ZKlxNlnfDk/nySn8C6RlCu/t?= =?us-ascii?Q?V6A+kb6zzWQI+PvdwNu1jQew8agjL2Yg8SHSrZJisyu/i5B9cTNrHZTYvX3w?= =?us-ascii?Q?uz9Ozh1NW9HkJTxWtXYTCKtLieIWGobTQbm8fYLF56QCyRJ/sMYWuCwqS1F5?= =?us-ascii?Q?fnsXlwODnSocVPvp2o3SeQXP8xsZ4zT+BX2QRVQG8h7+1iXk9YMNvPkLmIZN?= =?us-ascii?Q?QFZbPndZUuQs9NLggIjHnNkIMBboM+J9C8LBw3V3hm6F1zpHHj8hCGRUSZ4l?= =?us-ascii?Q?XaKZRgKU2G/TSyG1leZYA500/bUGq+1WIcmDt0r7CUc6FLut3toh/roeRjtW?= =?us-ascii?Q?ZmtOwwUTonV4L5h0L7xU4Z+R9EWr9lltQVzXTicTgtrkK32cekaHBL75q+h+?= =?us-ascii?Q?siwo3kUnFJbpeF73jSYExCXeez/DBILLqfGstDQ0bujnK19S7U1RNai1MzOn?= =?us-ascii?Q?BRevh9pn+DzRqiJl3fvMCl9IuARFm9ikxvZXVROuX2hHAliC9rv8OeBH2UWF?= =?us-ascii?Q?Agdb/l+3/X4/GoDLMSDfZevqRjk+T+lke7rNTQoq430CpI85izZCSu3OU+es?= =?us-ascii?Q?DNlxMI3x4G7eHZAHTaC6h8AN/1KDymKmLF2Cim/wyVdoZJW6i9GRBJ4eMAB4?= =?us-ascii?Q?iGGErK5+hPfBPYPpcbFHouJspu6q51ijmY3u/tSivCdveYGEboYopxTLn+qq?= =?us-ascii?Q?TKs7XM+U2ZcnV9Y4FzICuhkPzT4KNuIWhu4p+zbaFbtpBVhMHy02mv7pEEgZ?= =?us-ascii?Q?dvAKMghz0KxeloCEuV5Wg8Lf9ODixXm6v87r0zayges5sK+kHo8o9TkujXBw?= =?us-ascii?Q?slz5LBpRKEM+jpuy6jZLZT2AP0Y+wgmkmGZ+DFZ6+WNR35NWprI/qwAsKwRk?= =?us-ascii?Q?ZkPn8fAsYIYDCq4QJWtE9ni4HG2dNgONZ3/bRiQPKyp7eWoqA7bJa06r0fVc?= =?us-ascii?Q?treJR24f8ritZD/lmZbsb907n/qQrB1lGGtp/YFv82onwV1gd+398pVU9FM9?= =?us-ascii?Q?N19gzh6Z+abRCDRybKg9q00ooajOolfuZrBWGh6Elrqz9mlUE41MH7v/gRfS?= =?us-ascii?Q?9zh2D5b1ONLz?= MIME-Version: 1.0
I've started looking at OpenARC but the documentation is scarce and it isn't clear if the project is being maintained. My preference would be to stick with Mailman for ARC support if possible. I'm also trying to get Google's servers to accept the emails so that I can compare the headers, just in case it is a Microsoft issue ... but at the moment, Microsoft is accepting the emails and Google isn't :(