diff --git a/Dockerfile b/Dockerfile
index f9b9a8c..365bfd9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,4 +22,4 @@ RUN pip3 install -r /data/requirements.txt && \
 
 EXPOSE 1025
 
-CMD [ "/usr/bin/python3", "/data/smtp2slack4qnap.py" ]
+CMD [ "/bin/sh", "-c", "/usr/bin/python3", "/data/smtp2slack4qnap.py" ]
diff --git a/smtp2slack4qnap.py b/smtp2slack4qnap.py
index 70eeef2..8c8c3d6 100644
--- a/smtp2slack4qnap.py
+++ b/smtp2slack4qnap.py
@@ -88,5 +88,4 @@ if __name__ == '__main__':
     handler = CustomHandler()
     controller = MyController(handler, hostname=LHOST, port=LPORT)
     controller.start()
-
-k=input('SMTP server has started ...')
+    input('SMTP server has started ...')