diff --git a/Dockerfile b/Dockerfile
index c0dfaac..b1f74c4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,6 +12,6 @@ WORKDIR /etc/exim
 
 EXPOSE 25
 
-CMD [ "/usr/sbin/exim", "-bd", "-q15m" ]
+CMD [ "/usr/sbin/exim", "-bdf", "-q15m" ]