This file is indexed.

/etc/apparmor.d/abstractions/user-mail is in apparmor 2.9.0-3.

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

The actual contents of the file can be viewed below.

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# ------------------------------------------------------------------
#
#    Copyright (C) 2002-2006 Novell/SUSE
#    Copyright (C) 2014 Canonical Ltd.
#
#    This program is free software; you can redistribute it and/or
#    modify it under the terms of version 2 of the GNU General Public
#    License published by the Free Software Foundation.
#
# ------------------------------------------------------------------

  # location of user mail, spool and mboxes
  owner @{HOME}/[mM]ail/      r,
  owner @{HOME}/[mM]ail/**    rwl,
  owner @{HOME}/postponed*    rwl,
  /var/{,spool/}mail/         r,
  /var/{,spool/}mail/*        rwl,
  owner @{HOME}/mbox.lock*    rwl,
  owner @{HOME}/mbox          rw,
  owner @{HOME}/inbox         rw,
  owner @{HOME}/.forward      r,
  owner @{HOME}/Maildir/      r,
  owner @{HOME}/Maildir/**    rwl,