post_upgrade() {
	if ! getent passwd opendkim &>/dev/null; then
		useradd -r -g mail -G adm -d / -s /bin/nologin opendkim >/dev/null
	fi
	if ! groups opendkim | grep adm &>/dev/null; then
		gpasswd -a opendkim adm >/dev/null
	fi
	opendkim_shell=$(getent passwd opendkim | cut -d: -f7)
	if [ "$opendkim_shell" != '/bin/nologin' ]; then
		chsh -s /bin/nologin opendkim &>/dev/null
	fi
}

post_install() {
	post_upgrade
	chown -R opendkim:mail etc/opendkim
	cat <<EOF
>>>  Check and modify /etc/opendkim/opendkim.conf before starting
EOF
}

post_remove() {
	if getent passwd opendkim &>/dev/null; then
		userdel opendkim >/dev/null
	fi
}