Subject: Undelivered Mail Returned to Sender
From: Mail Delivery System <[email-masked]>
To: [email-masked]
Date: Sat, 9 Dec 2023 19:15:48 +0100 (CET)

This is the mail system at host mailout.example.com.

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 cdxmailin02.blah.com[100.64.49.209] said: 554
    5.7.0 Reject, id=53915-07 - DANGEROUS, servertime=Dec 09 19:15:48,
    server=mailin.prod.blah.blubb, client=100.64.121.182 (in reply to end of DATA
    command)

Subject: test Sat, 09 Dec 2023 19:15:33 +0100
From: [email-masked]
To: [email-masked]
Date: Sat, 09 Dec 2023 19:15:33 +0100

XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X