diff --git a/files/main.py b/files/main.py
index 8a86ca9..7847ba1 100755
--- a/files/main.py
+++ b/files/main.py
@@ -107,7 +107,7 @@ def smtp_send(content):
 		mail_message['To']	= recipient
 		smtp_server.sendmail(from_addr=smtp_from,\
 			to_addrs=recipient,msg=mail_message.as_string())
-    delete mail_message['To']
+		del mail_message['To']
 	smtp_server.quit()
 
 def redmine_request(path):