/etc/exim4/conf.d/retry/30_exim4-config is in exim4-config 4.90.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | ### retry/30_exim4-config
#################################
# This single retry rule applies to all domains and all errors. It specifies
# retries every 15 minutes for 2 hours, then increasing retry intervals,
# starting at 1 hour and increasing each time by a factor of 1.5, up to 16
# hours, then retries every 6 hours until 4 days have passed since the first
# failed delivery.
# Please note that these rules only limit the frequency of retries, the
# effective retry-time depends on the frequency of queue-running, too.
# See QUEUEINTERVAL in /etc/default/exim4.
# Address or Domain Error Retries
# ----------------- ----- -------
* * F,2h,15m; G,16h,1h,1.5; F,4d,6h
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