This file is indexed.

/etc/cron.daily/couriergrey is in couriergrey 0.3.2-5build2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/bash

if [ ! -x /usr/lib/courier/filters/couriergrey ]; then exit 0
fi

# This is couriergrey's database cleanup cron job.
su -s /bin/sh -c "/usr/lib/courier/filters/couriergrey -e 365" daemon \
  > /dev/null || exit $?