Subject: Final failure
From: Mail Delivery Subsystem <[email-masked]>
To: [email-masked]
Date: Tue, 02 Jun 2026 10:06:00 +0000

Delivery Status Notification.
Final-Recipient: rfc822; [email-masked]
Action: failed
Status: 5.4.7
Diagnostic-Code: smtp; Could not deliver after retry period. Final failure, giving up.