This file is indexed.

/lib/systemd/system/chasquid-submission.socket is in chasquid 0.04-1.

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=chasquid mail daemon (submission sockets)

[Socket]
ListenStream=587
FileDescriptorName=submission
Service=chasquid.service

[Install]
WantedBy=chasquid.target