Delivery has failed to these recipients or groups:

NoReply@vauban.lu
Plusieurs tentatives de remise de votre message ont échoué et nous avons arrêté d'essayer.

Your message wasn't delivered because the email admin for the organization 'VAUBAN.LOCAL' created an email rule restriction. Please contact the email admin for that organization and ask them to remove or update the rule restriction.
For more information about this error, see DSN code 5.7.1 in Exchange Online - Office 365.

Diagnostic information for administrators:

Generating server: VMS-EXC-01.VAUBAN.LOCAL

NoReply@vauban.lu
Remote Server returned '550 5.7.1 TRANSPORT.RULES.RejectMessage; the message was rejected by organization policy'

Original message headers:

From: <support@tabuleo.fr>
To: <NoReply@vauban.lu>
Subject: Ticket assistance - #2509-0176
Message-ID: <3461b05c-c799-6367-adc9-b2ed9c51834b@tabuleo.fr>
Content-Transfer-Encoding: quoted-printable
Date: Wed, 3 Sep 2025 13:35:30 +0000
MIME-Version: 1.0
Content-Type: text/html; charset="utf-8"

Reporting-MTA: dns;VMS-EXC-01.VAUBAN.LOCAL
Received-From-MTA: dns;vauban.lu
Arrival-Date: Wed, 3 Sep 2025 13:43:13 +0000

Final-Recipient: rfc822;NoReply@vauban.lu
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;550 5.7.1 TRANSPORT.RULES.RejectMessage; the message was rejected by organization policy