Create Dockerfile

Dockerfile

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+FROM python:3.9-slim
+
+WORKDIR /app
+
+COPY requirements.txt requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+# Hugging Face Spaces typically expects the application to run on port 7860
+# and will route external traffic (HTTPS on port 443) to this internal port.
+ENV PORT 7860
+EXPOSE 7860
+
+# Command to run your Flask app using Gunicorn
+# Assumes your Flask app instance is named 'app' in 'email_sender_api.py'
+CMD ["gunicorn", "--bind", "0.0.0.0:7860", "email_sender_api:app"]