This file is indexed.

/etc/sqlgrey/README is in sqlgrey 1:1.8.0-1.

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

The actual contents of the file can be viewed below.

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README file for sqlgrey updated content

Don't touch these files, they are automatically updated when
you run update_sqlgrey_config:
- clients_fqdn_whitelist: don't greylist these DNS names [*]
- clients_ip_whitelist  : don't greylist these IP addresses [*]
- dyn_fqdn.regexp       : used by new 'smart' algorithm [x]
- smtp_server.regexp    : used by new 'smart' algortihm [x]

[*]: in use starting with 1.4.0
[x]: in use since 1.5.1, regexps looking for known fqdns patterns