diff --git a/mm2sympa.sh b/mm2sympa.sh
index 4acf638cc785b2540f6e0fb7db3d3a3376d5728b..9e0241afae6a1cad03d7f0ff4ae4cff7e0f352a9 100755
--- a/mm2sympa.sh
+++ b/mm2sympa.sh
@@ -20,6 +20,11 @@ if [ ! -f "/etc/sympa/$robot/robot.conf" ]; then
     exit 1
 fi
 
+if [ -z "$MMPW" ]; then
+    echo "Please set MMPW to the listadmin password of $mmdomain!" >&2
+    exit 1
+fi
+
 function sshml() {
     ssh -o ControlPath="~/.ssh/cp-$MPI_ROOT-%C" -o ControlMaster=auto -o ControlPersist=600s $mmdomain -l root "$@"
 }
@@ -33,7 +38,7 @@ tmpdir=$(mktemp -t -d mm2sympa.${mailmanlist/@/AT}.XXXXXXXX)
 chmod go+rx $tmpdir
 trap "rm -rf $tmpdir" 0 1 2 5 15 EXIT
 
-set -x
+#set -x
 
 # create list based on mailman config
 inputpy=$tmpdir/input.py