diff --git a/update-fwds.py b/update-fwds.py
new file mode 100644
index 0000000..88a7ccf
--- /dev/null
+++ b/update-fwds.py
@@ -0,0 +1,36 @@
+#!/usr/bin/python3
+# Put this script into a Crontab on your Mailcow instance.
+# I use an interval of 5 minutes.
+import requests
+import socket
+# Your Mailcow API key
+API_KEY=''
+# The forwarding host you would like to whitelist
+DYN_FWDHOST='dsl-dynamic-host.example.org'
+# The public-facing hostname of your Mailcow instance
+MAILCOW_HOSTNAME='mx.example.org'
+
+s = requests.Session()
+s.headers.update({'X-API-Key': API_KEY})
+r = s.get('https://{}/api/v1/get/fwdhost/all'.format(MAILCOW_HOSTNAME))
+r.raise_for_status()
+current_fwdhosts = r.json()
+print('got current hosts: {}'.format(r.text))
+home_ip = socket.gethostbyname(DYN_FWDHOST)
+current_ips = [x['host'] for x in current_fwdhosts]
+if home_ip in current_ips:
+    exit('Home IP already registered, exiting.')
+fwdhosts_to_delete = []
+if current_fwdhosts:
+    for host in current_fwdhosts:
+        if host['source'] == DYN_FWDHOST:
+            fwdhosts_to_delete.append(host['host']) # ['host'] => IP
+d = s.post('https://{}/api/v1/delete/fwdhost'.format(MAILCOW_HOSTNAME), json=fwdhosts_to_delete)
+print('Deleted hosts {} with response {}:'.format(str(fwdhosts_to_delete), d.status_code))
+print(d.text)
+a = s.post('https://{}/api/v1/add/fwdhost'.format(MAILCOW_HOSTNAME), json={
+    'filter_spam':'0',
+    'hostname': DYN_FWDHOST
+    })
+print('Added host {} with response {}'.format(DYN_FWDHOST, a.status_code))
+exit(0)