diff --git a/data/Dockerfiles/postfix/postfix.sh b/data/Dockerfiles/postfix/postfix.sh
index d55d8f47..ac96c0ce 100755
--- a/data/Dockerfiles/postfix/postfix.sh
+++ b/data/Dockerfiles/postfix/postfix.sh
@@ -323,6 +323,11 @@ if [ ! -f /opt/postfix/conf/custom_transport.pcre ]; then
   touch /opt/postfix/conf/custom_transport.pcre
 fi
 
+if [[ ! -f /opt/postfix/conf/custom_postscreen_whitelist.cidr ]]; then
+  echo "Creating dummy custom_postscreen_whitelist.cidr"
+  echo '# Autogenerated by mailcow' > /opt/postfix/conf/custom_postscreen_whitelist.cidr
+fi
+
 # Fix Postfix permissions
 chown -R root:postfix /opt/postfix/conf/sql/ /opt/postfix/conf/custom_transport.pcre
 chmod 640 /opt/postfix/conf/sql/*.cf /opt/postfix/conf/custom_transport.pcre