diff --git a/postfixd.sh b/postfixd.sh
index 058ae26..5af7911 100755
--- a/postfixd.sh
+++ b/postfixd.sh
@@ -22,6 +22,15 @@ case $1 in
 
     test -n "${NETWORKS}" && postconf -e mynetworks="${NETWORKS}"
 
+    if ! test -f /etc/monit.d/cert.conf ; then
+      cat >/etc/monit.d/cert.conf <<MONIT
+check file certificate with path /etc/letsencrypt/live/${SUTTY}/fullchain.pem
+  if does not exist then alert
+  if changed checksum then exec "/usr/sbin/postfix reload"
+MONIT
+      monit reload
+    fi
+
     ;;
   stop) ;;
 esac