This file is indexed.

/usr/share/debbugs/templates/en_US/mail/serious_mail_misconfiguration.tmpl is in debbugs-web 2.6.0.

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

The actual contents of the file can be viewed below.

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(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact {$config{maintainer_email}}
immediately.)