As Laura said, suspect an appliance, which can make the MX records tricky, and probably requires a custom Connector setup.
Far outside the scope of this list, sorry. Aloha, Michael. -- Michael J Wise Microsoft Corporation| Spam Analysis "Your Spam Specimen Has Been Processed." Open a ticket for Hotmail<http://go.microsoft.com/fwlink/?LinkID=614866> ? -----Original Message----- From: mailop <[email protected]> On Behalf Of Benny Pedersen via mailop Sent: Thursday, October 2, 2025 10:29 AM To: [email protected] Subject: Re: [mailop] [EXTERNAL] MS365 mail loop Michael Wise via mailop skrev den 2025-10-02 19:18: > Check the MX records. > Did the domain/tenant recently move on or off of Office365? Authentication-Results mx.junc.eu (amavis); dkim=fail (1024-bit key) reason="fail (message has been altered)" header.d=microsoft.com Authentication-Results dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microsoft.com; ups AR header fails :/ _______________________________________________ mailop mailing list [email protected]<mailto:[email protected]> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Flist.mailop.org%2Flistinfo%2Fmailop&data=05%7C02%7Cmichael.wise%40microsoft.com%7Cc163357261bb42b672b008de01da65c1%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638950234698394272%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=hWd4Ngenn3SWInGb09DbMcg5ZMyflfyvzbrqilfZZ7o%3D&reserved=0<https://list.mailop.org/listinfo/mailop>
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