/etc/apparmor.d/tunables/dovecot 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) 2013 Christian Boltz
#
# 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.
#
# ------------------------------------------------------------------
# vim:ft=apparmor
# @{DOVECOT_MAILSTORE} is a space-separated list of all directories
# where dovecot is allowed to store and read mails
#
# The default value is quite broad to avoid breaking existing setups.
# Please change @{DOVECOT_MAILSTORE} to (only) contain the directory
# you use, and remove everything else.
@{DOVECOT_MAILSTORE}=@{HOME}/Maildir/ @{HOME}/mail/ @{HOME}/Mail/ /var/vmail/ /var/mail/ /var/spool/mail/
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