/usr/ is in php-horde-mail-autoconfig 1.0.1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/php/
/usr/share/php/.registry/
/usr/share/php/.registry/.channel.pear.horde.org/
/usr/share/php/.registry/.channel.pear.horde.org/horde_mail_autoconfig.reg
/usr/share/php/Horde/
/usr/share/php/Horde/Mail/
/usr/share/php/Horde/Mail/Autoconfig/
/usr/share/php/Horde/Mail/Autoconfig/Exception.php
/usr/share/php/Horde/Mail/Autoconfig/Driver/
/usr/share/php/Horde/Mail/Autoconfig/Driver/Guess.php
/usr/share/php/Horde/Mail/Autoconfig/Driver/Srv.php
/usr/share/php/Horde/Mail/Autoconfig/Driver/Thunderbird.php
/usr/share/php/Horde/Mail/Autoconfig/Driver.php
/usr/share/php/Horde/Mail/Autoconfig/Server.php
/usr/share/php/Horde/Mail/Autoconfig/Server/
/usr/share/php/Horde/Mail/Autoconfig/Server/Msa.php
/usr/share/php/Horde/Mail/Autoconfig/Server/Imap.php
/usr/share/php/Horde/Mail/Autoconfig/Server/Pop3.php
/usr/share/php/Horde/Mail/Autoconfig.php
/usr/share/doc/
/usr/share/doc/php-horde-mail-autoconfig/
/usr/share/doc/php-horde-mail-autoconfig/changelog.Debian.gz
/usr/share/doc/php-horde-mail-autoconfig/changelog.gz
/usr/share/doc/php-horde-mail-autoconfig/package.xml.gz
/usr/share/doc/php-horde-mail-autoconfig/copyright