diff --git a/README.md b/README.md
index 798367e..2798bd1 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,9 @@ Leisure project. A REST API that sends a one-time authentication code (a.k.a OTP
 Setup:
 - Create a new `.env` file
 - Add your `EMAIL_SENDER` and `EMAIL_PASSWORD` in your `.env` file
+- Optional:
+    - By default I use gmail for email host, you can configure your `HOST` in the `.env` file.
+    - You can also add `PORT` in `.env`
 - Create or use an API test app like Postman
 
 Usage:
diff --git a/main.py b/main.py
index 87ec116..00e810f 100644
--- a/main.py
+++ b/main.py
@@ -74,7 +74,7 @@ def send_email():
     # Everyone has a different email host service
     # By default we use gmail to test our emails
     mail_host = os.environ.get("HOST") if os.environ.get("HOST") is not None else "smtp.gmail.com"
-    mail_port = 465
+    mail_port = os.environ.get("PORT") if os.environ.get("PORT") is not None else 465
 
     if mail_sender is None or mail_password is None:
         return jsonify({