To run one is required to have a GCP project with OAuth2.0 client ID and secret key. The client ID and secret key are to be stored in the credentials.json file. The credentials.json file is to be stored in the same directory as the python script. Which can be learned from the following link: Gmail API Python Quickstart

For this repo purpose i have a message.py file which gives me a function where i provide the name of the recipient and the company to be sent to the recipient. Then a custom message is returned from the function.

# message.py
def give_text_html(recipient_name, recipient_company):
    text = f"Dear {recipient_name},\n\n{recipient_company}\n\nRegards,\nSender"
    html = f"""\
    <html>
    <body>
        <p>Dear {recipient_name},<br>
        {recipient_company}<br>
        Regards,<br>
        Sender
        </p>
    </body>
    </html>
    """
    return text, html

You should create a separate account for testing and add that account has a user of the OAuth2.0 service.

Add your email in a .env file as SENDER_EMAIL as shown in .env.example file.

To Run the script:

python3 main.py