/usr/share/tripleo-image-elements/postfix/install.d/59-postfix is in python-tripleo-image-elements 0.7.1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/bash
set -eux
install-packages postfix
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