diff --git a/service/postfix/run b/service/postfix/run
index 74232fb..3cb8954 100755
--- a/service/postfix/run
+++ b/service/postfix/run
@@ -15,6 +15,7 @@ set -e
 postfix check 2>&1
 
 # run Postfix
+set -x
 exec /usr/lib/postfix/master 2>&1
 
 # Do not use 'postfix start-fg' command since it does not handle the signals,