This file is indexed.

/lib/systemd/system/nullmailer.service is in nullmailer 1:2.1-5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Unit]
Description=Nullmailer relay-only MTA
After=network.target
RequiresMountsFor=/var/spool/nullmailer
ConditionPathExists=/var/spool/nullmailer/queue
Documentation=man:nullmailer(7)

[Service]
WorkingDirectory=/var/spool/nullmailer
ExecStart=/usr/sbin/nullmailer-send
User=mail
Group=mail
Restart=always
SyslogFacility=mail

[Install]
WantedBy=multi-user.target