A simple web-based SMTP testing tool built in Python (Flask). Useful for quickly testing SMTP connectivity, sending test emails, and debugging mail server setups.

✅ Beautiful Bootstrap 5 UI
✅ Supports:

• No encryption
• STARTTLS
• SSL/TLS

✅ Optional SMTP authentication
✅ Shows high-level error messages
✅ Retains form data after sending
✅ Runs easily in Docker
✅ SMTP connection logs visible in console for debugging

First, install Flask:

pip install flask

Then run the app:

python smtp_tester_web.py

Open your browser at:

http://localhost:8080

Build the Docker image:

docker build -t tayyabtahir/smtp-server .

Run the container:

docker run -d --name smtp-server -p 8080:8080 --restart always tayyabtahir/smtp-server

Run the container with docker compose:

version: "3.8"

services:
  smtp-server:
    image: tayyabtahir/smtp-server
    container_name: smtp-server
    ports:
      - "8080:8080"
    restart: always

docker compose up -d

Then access it at:

http://localhost:8080

• Python 3.11+
• Flask

• Test internal mail relays.
• Check SMTP authentication for cloud services.
• Diagnose mail server issues (wrong ports, TLS errors, auth failures).

MIT License

Made with ❤️ by Tayyab Tahir