Email OTP Verification using the flask and SMTPLIB module of Python

Set up send_mail.py by adding sender's email address and app password (Only work for Gmail accounts). Install flask, wtf-flask, and other necessary modlues

Two-Factor Authentication Web Application

This is a simple Flask-based web application that implements Two-Factor Authentication (2FA) using email for additional security during user login. When a user attempts to log in, a unique authentication code is sent to their email, which must be entered to complete the login process.

Requirements

• Flask
• Flask-Login
• smtplib (Python standard library)

You can install the necessary dependencies by running the following command:

pip install Flask Flask-Login

Steps to Run

1. Create an App Password for Gmail

If you're using Gmail to send the 2FA code, you'll need to create an App Password.

• Go to your Google Account Settings.
• Under the Security section, turn on 2-Step Verification (if you haven’t already).
• Create an App Password for sending emails.

2. Add the Gmail Sender and App Password

After you have the app password, add the email sender (your Gmail address) and the generated app password to the sendmail.py file.

# sendmail.py
sender_email = "your-email@gmail.com"
app_password = "your-app-password"

3. Run the Application

Start the Flask application by running the following command:

python web.py

• The application uses Flask-Login for session management and user authentication built from scratch.