Hi,
I’m trying to set up a Mailjet relay, so that some specific addresses are sending their mails via this relay.
So far it seem to be working, however Microsoft seem to have an issue with the DMARC configuration or the DKIM signature.
It took me some time to figure out that, when using DMARC, it’s also important to have the return path from the same domain like the senders domain. Mailjet has a possibility to change this return path domain, which I did, according to the following blog post.
https://www.mailjet.com/blog/deliverability/return-path-customization-explained/
This was the last piece of the puzzle to get all the DMARC checks at different websites pass.
Also Gmail does report all pass in the header.
However, I’m not able to get Microsoft to be happy with my DMARC / DKIM settings. But I’m out of ideas, what could be wrong.
I hope, anyone from the community has an idea what could be missing.
Thanks,
MiNe
This is the entire mail, like it is received at a Microsoft Office365 mail account:
Received-SPF: Pass (protection.outlook.com: domain of bnc3.masked.org
 designates 185.250.237.47 as permitted sender)
 receiver=protection.outlook.com; client-ip=185.250.237.47;
 helo=o47.p38.mailjet.com; pr=C
Message-Id: <896a8b22.AWcAAF_ZDucAAAAAAAAAA9Bb2xoAAYKJL4wAAAAAAC2CdQBnhp5m@mailjet.com>
From: Masked <mailing@masked.org>
To: masked.address@a1.digital
Subject: Test17
Date: Tue, 14 Jan 2025 18:27:00 +0100
Feedback-Id: 42.2982517.2744913:MJ
Content-Type: text/plain
X-MS-Exchange-Organization-ExpirationStartTime: 14 Jan 2025 17:27:03.0570
 (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:
 47fb7310-6d4a-4f10-c08c-08dd34c0a905
X-EOPAttributedMessage: 0
X-EOPTenantAttributedMessage: 26a1e041-d3a2-4d59-a14a-acaedd98e798:0
X-MS-Exchange-Organization-MessageDirectionality: Incoming
X-MS-PublicTrafficType: Email
X-MS-TrafficTypeDiagnostic:
 AMS0EPF000001B4:EE_|PAWPR05MB10952:EE_|AM9PR05MB8547:EE_
X-MS-Exchange-Organization-AuthSource:
 AMS0EPF000001B4.eurprd05.prod.outlook.com
X-MS-Exchange-Organization-AuthAs: Anonymous
X-MS-Office365-Filtering-Correlation-Id: 47fb7310-6d4a-4f10-c08c-08dd34c0a905
X-MS-Exchange-AtpMessageProperties: SA|SL
X-MS-Exchange-Organization-SCL: -1
X-EOP-Rule: EOP.A1.SetSCLto6.DKIMFail
X-Microsoft-Antispam: BCL:0;ARA:13230040|29132699027|4022899009;
X-Forefront-Antispam-Report:
 CIP:185.250.237.47;CTRY:FR;LANG:en;SCL:-1;SRV:;IPV:NLI;SFV:SFE;H:o47.p38.mailjet.com;PTR:o47.p38.mailjet.com;CAT:NONE;SFS:(13230040)(29132699027)(4022899009);DIR:INB;
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jan 2025 17:27:02.9632
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 47fb7310-6d4a-4f10-c08c-08dd34c0a905
X-MS-Exchange-CrossTenant-Id: 26a1e041-d3a2-4d59-a14a-acaedd98e798
X-MS-Exchange-CrossTenant-AuthSource:
 AMS0EPF000001B4.eurprd05.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: Internet
X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAWPR05MB10952
X-MS-Exchange-Transport-EndToEndLatency: 00:00:03.0922441
X-MS-Exchange-Processed-By-BccFoldering: 15.20.8356.008
X-Microsoft-Antispam-Mailbox-Delivery:
 wl:1;pcwl:1;ucf:0;jmr:0;auth:0;dest:I;ENG:(910001)(944506478)(944626604)(920097)(811239)(255002)(410001)(930097)(140003)(1420198);
X-Microsoft-Antispam-Message-Info:
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Content-Length: 10
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Last test
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<html><p>Last test</p></html>

<img src=3D"https://siu82.mjt.lu/oo/AWcAAF_ZDucAAAAAAAAAA9Bb2xoAAYKJL4wAAAA=
AAC2CdQBnhp5mykM4drQrS2apYUNu3YT0sQAp4lE/eb73776b/e.gif" height=3D"1" width=
=3D"1" alt=3D"" border=3D"0" style=3D"height:1px;width:1px;border:0;"/>
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