/etc/courier/dsndelayed.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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DELAYS IN DELIVERING YOUR MESSAGE
The delivery of the following E-mail message has been delayed. This is an
advisory notice only; it is sent only to notify you about a temporary delay
in delivering your message. You DO NOT need to do anything at this time.
Additional attempts to deliver your message will be made. Some possible
reasons for this delay:
* Network congestion or failure.
* The destination mail server is temporarily off-line.
Diagnostic information is provided below for each recipient. If copies of
this message were sent to additional recipients, deliveries to those
addresses are not included in this notice. This is an advisory notice for
the following addresses only:
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