/usr/share/doc/ is in mailfront 1.16-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/mailfront/
/usr/share/doc/mailfront/protocol-qmtp.html
/usr/share/doc/mailfront/plugin-cvm-validate.html
/usr/share/doc/mailfront/pop3front.html
/usr/share/doc/mailfront/std-handle.html
/usr/share/doc/mailfront/plugin-patterns.html
/usr/share/doc/mailfront/changelog.gz
/usr/share/doc/mailfront/plugin-mailrules.html
/usr/share/doc/mailfront/NEWS
/usr/share/doc/mailfront/plugin-counters.html
/usr/share/doc/mailfront/README.Debian
/usr/share/doc/mailfront/copyright
/usr/share/doc/mailfront/protocol-smtp.html
/usr/share/doc/mailfront/plugin-require-auth.html
/usr/share/doc/mailfront/mailrulesx.html
/usr/share/doc/mailfront/plugin-template.html
/usr/share/doc/mailfront/VERSION
/usr/share/doc/mailfront/plugin-relayclient.html
/usr/share/doc/mailfront/plugin-force-file.html
/usr/share/doc/mailfront/msa.html
/usr/share/doc/mailfront/changelog.Debian.gz
/usr/share/doc/mailfront/ANNOUNCEMENT
/usr/share/doc/mailfront/plugin-clamav.html
/usr/share/doc/mailfront/protocol-qmqp.html
/usr/share/doc/mailfront/etc/
/usr/share/doc/mailfront/etc/smtpfront-qmail/
/usr/share/doc/mailfront/etc/smtpfront-qmail/log/
/usr/share/doc/mailfront/etc/smtpfront-qmail/log/run
/usr/share/doc/mailfront/etc/smtpfront-qmail/run
/usr/share/doc/mailfront/etc/smtpfront-qmail/peers/
/usr/share/doc/mailfront/etc/smtpfront-qmail/peers/127
/usr/share/doc/mailfront/plugin-qmail-validate.html
/usr/share/doc/mailfront/plugin-accept-recipient.html
/usr/share/doc/mailfront/plugin-accept.html
/usr/share/doc/mailfront/NEWS.Debian.gz
/usr/share/doc/mailfront/mailfront.html
/usr/share/doc/mailfront/README
/usr/share/doc/mailfront/plugin-check-fqdn.html
/usr/share/doc/mailfront/plugin-accept-sender.html
/usr/share/doc/mailfront/plugin-api.html
/usr/share/doc/mailfront/imapfront.html
/usr/share/doc/mailfront/backend-qmail.html
/usr/share/doc/mailfront/backend-echo.html
/usr/share/doc/mailfront/mailrules.html
/usr/share/doc/mailfront/TODO
/usr/share/doc/mailfront/plugin-add-received.html
/usr/share/doc/mailfront/plugin-reject.html
/usr/share/doc/mailfront/plugin-spamassassin.html