diff --git a/mailcow-cert-sync.timer b/mailcow-cert-sync.timer
new file mode 100644
index 0000000..3684662
--- /dev/null
+++ b/mailcow-cert-sync.timer
@@ -0,0 +1,10 @@
+[Unit]
+Description=Run mailcow cert sync twice daily
+
+[Timer]
+OnCalendar=*-*-* 03,15:30:00
+Persistent=true
+RandomizedDelaySec=300
+
+[Install]
+WantedBy=timers.target