/etc/courier/dsnrelayed.txt is in courier-mta 0.68.2-1ubuntu7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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MESSAGE DELIVERED TO A MAIL GATEWAY
You requested a delivery acknowledgement (a return receipt) for the
following recipients of your E-mail message. Unfortunately, your message
has been transferred to an intermediate mail gateway that is not capable
of generating delivery acknowledgements.
Unless your message is eventually returned as undeliverable, you may not
receive any further delivery notices for the following addresses:
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