Subject: Mail delivery failed: returning message to sender

From: Mail Delivery System <[email-masked]>
Date: Tue, 19 Aug 2025 02:32:57 -0700

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  [email-masked]
    host zaccogroup.mail.protection.outlook.com [52.101.68.25]
    SMTP error from remote mail server after RCPT TO:<[email-masked]>:
    550 5.7.64 TenantAttribution; Relay Access Denied [ValidationStatus of '' is EmptyCertificate] [DB3PEPF0000885E.eurprd02.prod.outlook.com 2025-08-19T09:32:57.831Z 08DDDBF6BBC90CBB]