diff --git a/Dockerfile b/Dockerfile
index 80f7154..2239fac 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,4 +20,6 @@ RUN pip3 install -r /data/requirements.txt && \
 
 #USER python
 
+EXPOSE 1025
+
 CMD [ "/usr/bin/python3", "/data/smtp2slack4qnap.py" ]
diff --git a/smtp2qnap4slack.py b/smtp2qnap4slack.py
index e2c85a9..e5abc3d 100644
--- a/smtp2qnap4slack.py
+++ b/smtp2qnap4slack.py
@@ -28,7 +28,7 @@ USER = 'username'
 SECRET = '1c18f3a76a7ad787ee1d5aea573bd51db1e559b85bbc4a3228076442e9a0bc90'
 
 # SMTP listener (set to localhost if running on QNAP device)
-LHOST, LPORT = '192.168.0.50', 1025
+LHOST, LPORT = '0.0.0.0', 1025
 
 # target slack authenticated webhook url (keep confidential!)
 WEBHOOK_URL = 'https://hooks.slack.com/services/XXXXXXXXX/YYYYYYYYY/aaaaaaaaaaaaaaaaaaaaaaaa'