Added import os

smtp2slack4qnap.py

@@ -7,6 +7,7 @@
 # generate self-signed cert (better than nothing):
 # openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 3650 -nodes -subj '/CN=localhost'
 
+import os
 import ssl
 import asyncio
 from aiosmtpd.controller import Controller