diff --git a/prometheus-entrouvert-exporter/prometheus-system-exporter.py b/prometheus-entrouvert-exporter/prometheus-system-exporter.py
index a5a282f..4498481 100755
--- a/prometheus-entrouvert-exporter/prometheus-system-exporter.py
+++ b/prometheus-entrouvert-exporter/prometheus-system-exporter.py
@@ -74,6 +74,8 @@ def etckeeper(ctn):
 
 
 def exim(ctn):
+    if not os.path.exists('/usr/sbin/exim'):
+        return
     with open('/var/log/exim4/mainlog', 'rb') as fh:
         for line in fh.readlines():
             if b" ** " in line and not (