diff --git a/setup/mail-postfix.sh b/setup/mail-postfix.sh
index 1ea64a5..3904504 100755
--- a/setup/mail-postfix.sh
+++ b/setup/mail-postfix.sh
@@ -194,7 +194,7 @@ tools/editconf.py /etc/postfix/main.cf virtual_transport=lmtp:[127.0.0.1]:10025
 # whitelisted) then postfix does a DEFER_IF_REJECT, which results in all "unknown user" sorts of messages turning into #NODOC
 # "450 4.7.1 Client host rejected: Service unavailable". This is a retry code, so the mail doesn't properly bounce. #NODOC
 RECIPIENT_RESTRICTIONS=permit_sasl_authenticated,permit_mynetworks,\"reject_rbl_client zen.spamhaus.org\",reject_unlisted_recipient
-if [ $NO_GREYLISTING != "1" ]; then
+if [ $GREYLISTING != "1" ]; then
     RECIPIENT_RESTRICTIONS=${RECIPIENT_RESTRICTIONS},\"check_policy_service inet:127.0.0.1:10023\"
 fi
 tools/editconf.py /etc/postfix/main.cf \
diff --git a/setup/start.sh b/setup/start.sh
index 60a0349..b84d720 100755
--- a/setup/start.sh
+++ b/setup/start.sh
@@ -42,18 +42,20 @@ else
 	FIRST_TIME_SETUP=1
 fi
 
-if [ -z "${DEFAULT_HTTP_SSL_PORT:-}" ]; then
-    HTTP_SSL_PORT=443
-else
-    HTTP_SSL_PORT=$DEFAULT_HTTP_SSL_PORT
+if [ -z "${HTTP_SSL_PORT:-}" ]; then
+	HTTP_SSL_PORT=$([[ -z "${DEFAULT_HTTP_SSL_PORT:-}" ]] && echo "443" || echo "$DEFAULT_HTTP_SSL_PORT")
 fi
 
-if [ -z "${DEFAULT_NO_GREYLISTING:-}" ]; then
-    NO_GREYLISTING=0
-elif (($DEFAULT_NO_GREYLISTING > 0)); then
-    NO_GREYLISTING=1
-else
-    NO_GREYLISTING=0
+if [ -z "${GREYLISTING:-}" ]; then
+	GREYLISTING=$([[ -z "${DEFAULT_GREYLISTING:-}" ]] && echo "1" || echo "$DEFAULT_GREYLISTING")
+fi
+
+if [ -z "${POSTSRSD:-}" ]; then
+	POSTSRSD=$([[ -z "${DEFAULT_POSTSRSD:-}" ]] && echo "0" || echo "$DEFAULT_POSTSRSD")
+fi
+
+if [ -z "${POLICY_SPF:-}" ]; then
+	POLICY_SPF=$([[ -z "${DEFAULT_POLICY_SPF:-}" ]] && echo "0" || echo "$DEFAULT_POLICY_SPF")
 fi
 
 # Put a start script in a global location. We tell the user to run 'mailinabox'
@@ -108,7 +110,9 @@ PUBLIC_IPV6=$PUBLIC_IPV6
 PRIVATE_IP=$PRIVATE_IP
 PRIVATE_IPV6=$PRIVATE_IPV6
 HTTP_SSL_PORT=$HTTP_SSL_PORT
-NO_GREYLISTING=$NO_GREYLISTING
+GREYLISTING=$GREYLISTING
+POSTSRSD=$POSTSRSD
+POLICY_SPF=$POLICY_SPF
 EOF
 
 # Start service configuration.