This file is indexed.

/etc/xdg/kmail.categories is in kmail 4:17.12.3-0ubuntu1.

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

The actual contents of the file can be viewed below.

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org.kde.pim.kmail kmail (kmail)
org.kde.pim.sendlateragent kmail (sendlateragent)
org.kde.pim.archivemailagent kmail (archivemailagent)
org.kde.pim.followupreminderagent kmail (followupreminderagent)
org.kde.pim.kmail_plugin kmail (kmail kontact plugins)
org.kde.pim.mailfilteragent kmail (mailfilter agent)