This file is indexed.

/etc/courier/dsnfooter.txt is in courier-mta 0.78.0-2ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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If your message was also sent to additional recipients, their delivery
status is not included in this report.  You may or may not receive
other delivery status notifications for additional recipients.

The original message follows as a separate attachment.