diff --git a/extras/kolab_policy_spf b/extras/kolab_policy_spf
--- a/extras/kolab_policy_spf
+++ b/extras/kolab_policy_spf
@@ -7,9 +7,14 @@
 import json
 import time
 import sys
+import logging
+from logging.handlers import SysLogHandler
 
 import requests
 
+logger = logging.getLogger(__name__)
+logger.setLevel(logging.INFO)
+logger.addHandler(SysLogHandler())
 
 def read_request_input():
     """
@@ -23,6 +28,7 @@
 
     while not end_of_request:
         if (time.time() - start_time) >= 10:
+            logger.warning("policy/spf took too long reading the request.")
             print("action=DEFER_IF_PERMIT Temporary error, try again later.\n")
             sys.stdout.flush()
             sys.exit(0)
@@ -57,6 +63,7 @@
             )
         # pylint: disable=broad-except
         except Exception:
+            logger.warning("policy/spf request failed.")
             print("action=DEFER_IF_PERMIT Temporary error, try again later.\n")
             sys.stdout.flush()
             sys.exit(0)
@@ -65,6 +72,7 @@
             R = json.loads(RESPONSE.text)
         # pylint: disable=broad-except
         except Exception:
+            logger.warning("Failed to load json from policy/spf request.")
             print("action=DEFER_IF_PERMIT Temporary error, try again later.\n")
             sys.stdout.flush()
             sys.exit(0)
@@ -73,10 +81,15 @@
             for prepend in R['prepend']:
                 print("action=PREPEND {0}".format(prepend))
 
+        if 'log' in R:
+            for line in R['log']:
+                logger.warning(line)
+
         if RESPONSE.ok:
             print("action={0}\n".format(R['response']))
         else:
             print("action={0} {1}\n".format(R['response'], R['reason']))
+            logger.warning("spf failed with reason: %s" % R['reason'])
 
         sys.stdout.flush()
         sys.exit(0)
diff --git a/src/app/Http/Controllers/API/V4/PolicyController.php b/src/app/Http/Controllers/API/V4/PolicyController.php
--- a/src/app/Http/Controllers/API/V4/PolicyController.php
+++ b/src/app/Http/Controllers/API/V4/PolicyController.php
@@ -299,6 +299,7 @@
                 [
                     'response' => 'DEFER_IF_PERMIT',
                     'reason' => 'Temporary error. Please try again later.'
+                    'log' => ["SPF: Request without client_address: " . json_encode($data)]
                 ],
                 403
             );
@@ -314,6 +315,7 @@
                 [
                     'response' => 'DEFER_IF_PERMIT',
                     'reason' => 'Temporary error. Please try again later.'
+                    'log' => ["SPF: Request without recognizable network: " . json_encode($data)]
                 ],
                 403
             );