/etc/courier/dsnheader.txt is in courier-mta 0.66.1-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This is a delivery status notification from [#ME#],
running the Courier mail server, version 0.66.1.
The original message was received on [#FROMTIME#]
from [#FROMMTA#]
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