/etc/apparmor.d/abstractions/postfix-common is in apparmor 2.12-4ubuntu5.
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) 2002-2005 Novell/SUSE
# Copyright (C) 2015 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.
#
# ------------------------------------------------------------------
# used with postfix/*
capability setuid,
capability setgid,
capability sys_chroot,
# postfix's master can send us signals
signal receive peer=/usr/lib/postfix/master,
unix (send, receive) peer=(label=/usr/lib/postfix/master),
/etc/mailname r,
/etc/postfix/*.cf r,
/etc/postfix/*.db rk,
@{PROC}/net/if_inet6 r,
/usr/lib/postfix/*.so mr,
/usr/lib{,32,64}/sasl2/* mr,
/usr/lib{,32,64}/sasl2/ r,
/usr/lib/@{multiarch}/sasl2/* mr,
/usr/lib/@{multiarch}/sasl2/ r,
/var/spool/postfix/etc/* r,
/var/spool/postfix/lib/lib*.so* mr,
/var/spool/postfix/lib/@{multiarch}/lib*.so* mr,
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