Subject: Undelivered Mail Returned to Sender

From: [email-masked] (Mail Delivery System)
Date: Thu, 15 Jan 2026 13:34:06 +0000 (UTC)

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<[email-masked]>: host
    museumssharedservices-ae.mail.protection.outlook.com[52.101.147.1] said:
    550 5.4.1 Recipient address rejected: Access denied. For more information
    see https://aka.ms/EXOSmtpErrors [AU2PEPF00000013.AREP273.PROD.OUTLOOK.COM
    2026-01-15T13:34:06.691Z 08DE542698190B83] (in reply to RCPT TO command)