This file is a patch for the `cloudns`py` file from the Python `dns-lexicon` package to properly support CAA, MX and SRV records. This patch-file only works for dns-lexicon up till 3.13, as 3.14 contains a significant rewrite.

cloudns.py.diff

--- cloudns.py
+++ cloudns.py.patched
@@ -62,6 +62,24 @@
         if self._get_provider_option("port"):
             params["port"] = self._get_lexicon_option("port")
 
+        if rtype == 'CAA':
+            caa_split = params['record'].split()
+            params['caa_flag'] = caa_split[0]
+            params['caa_type'] = caa_split[1]
+            params['caa_value'] = caa_split[2]
+
+        if rtype == 'MX':
+            mx_split = params['record'].split()
+            params['priority'] = mx_split[0]
+            params['record'] = mx_split[1]
+
+        if rtype == 'SRV':
+            srv_split = params['record'].split()
+            params['priority'] = srv_split[0]
+            params['weight'] = srv_split[1]
+            params['port'] = srv_split[2]
+            params['record'] = srv_split[3]
+
         # Add new record by calling the ClouDNS API
         payload = self._post("/dns/add-record.json", params)
         LOGGER.debug("create_record: %s", payload)
@@ -82,6 +100,17 @@
         payload = payload if not isinstance(payload, list) else {}
         records = []
         for record in payload.values():
+            if record['type'] == 'CAA':
+                record['record'] = '%s %s "%s"' % (record['caa_flag'], record['caa_type'], record['caa_value'])
+
+            if record['type'] == 'MX':
+                if len(record['record']) == 0:
+                    record['record'] = "."
+                record['record'] = '%s %s' % (record['priority'], record['record'])
+
+            if record['type'] == 'SRV':
+                record['record'] = '%s %s %s %s.' % (record['priority'], record['weight'], record['port'], record['record'])
+
             records.append(
                 {
                     "type": record["type"],
@@ -120,6 +149,24 @@
         if self._get_provider_option("port"):
             params["port"] = self._get_provider_option("port")
 
+        if rtype == 'CAA':
+            caa_split = params['record'].split()
+            params['caa_flag'] = caa_split[0]
+            params['caa_type'] = caa_split[1]
+            params['caa_value'] = caa_split[2]
+
+        if rtype == 'MX':
+            mx_split = params['record'].split()
+            params['priority'] = mx_split[0]
+            params['record'] = mx_split[1]
+
+        if rtype == 'SRV':
+            srv_split = params['record'].split()
+            params['priority'] = srv_split[0]
+            params['weight'] = srv_split[1]
+            params['port'] = srv_split[2]
+            params['record'] = srv_split[3]
+
         # Update existing record by calling the ClouDNS API
         payload = self._post("/dns/mod-record.json", params)
         LOGGER.debug("update_record: %s", payload)