Fix missing or wrong shebangs and missing executable bits for scripts (#10318)
diff --git a/Tools/scripts/mailerdaemon.py b/Tools/scripts/mailerdaemon.py
old mode 100644
new mode 100755
index 62189f1..aeb451e
--- a/Tools/scripts/mailerdaemon.py
+++ b/Tools/scripts/mailerdaemon.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 """Classes to parse mailer-daemon messages."""
 
 import calendar