Set Up Google Cloud Project

• Enable Gmail API
• Add OAUTH 2.0 Client
• Redirect URLs should have (for testing)
  • http://localhost:8080/
  • http://localhost:8081/
• Download these libraries

pip install google-auth google-auth-oauthlib google-auth-httplib2 google-api-python-client

• This is what the code will be for the script

from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials
from google_auth_oauthlib.flow import InstalledAppFlow
from googleapiclient.discovery import build
import base64
import os
import json

# Step 1: Define constants
SCOPES = ['<https://www.googleapis.com/auth/gmail.send>']
CLIENT_ID = "1088850741773-2v0hh8m6a4j3f0164tu3v2ui9ubsimbm.apps.googleusercontent.com"
CLIENT_SECRET = [ADD SECRET HERE]

# Step 2: Authenticate
def authenticate():
    creds = None
    if os.path.exists('token.json'):
        creds = Credentials.from_authorized_user_file('token.json', SCOPES)
    if not creds or not creds.valid:
        if creds and creds.expired and creds.refresh_token:
            creds.refresh(Request())
        else:
            flow = InstalledAppFlow.from_client_secrets_file('credentials.json', SCOPES)
            # Try different ports if 8080 is blocked
            for port in range(8080, 8090):
                try:
                    creds = flow.run_local_server(port=port)
                    break
                except OSError:
                    continue
            # Save the credentials for future use
            with open('token.json', 'w') as token:
                token.write(creds.to_json())
    return creds

# Step 4: Send Email
def send_email(service, sender, recipient, subject, body):
    message = {
        'raw': base64.urlsafe_b64encode(
            f'From: {sender}\\r\\n'
            f'To: {recipient}\\r\\n'
            f'Subject: {subject}\\r\\n\\n'
            f'{body}'.encode('utf-8')
        ).decode('utf-8')
    }
    
    try:
        sent_message = service.users().messages().send(userId="me", body=message).execute()
        print(f"Message sent successfully: {sent_message}")
        return sent_message
    except Exception as e:
        print(f"An error occurred: {e}")
        raise e

# Main function
if __name__ == "__main__":
    # Authenticate
    creds = authenticate()
    service = build('gmail', 'v1', credentials=creds)

    # Send email
    send_email(
        service,
        "[email protected]",
        "[email protected]",
        "Test Email Subject",
        "This is the body of the email."
    )

• And accompanying .json files

{"token": "ya29.a0AeDClZAg9QCyAvZRSbRjcHCVeMfyE4bIe8yfZpWpFuOU_fbR2koHOXNTsh1l15L734H0MMuAAtRBZKrH9ivQGyPY91Gpndj-6HvDHiaNVyxa8kbipcOAQdtDieElGltKHAxmTlDjzoPK3Xcwud5dwkLYR-Kcf7ZGUpZc8OuCaCgYKAW8SAQ4SFQHGX2MiX0VgXj8hma0Y9aZAMTmmgQ0175", "refresh_token": "1//01eUHI41jTxjOCgYIARAAGAESNwF-L9IriiN2k33N9ulEGPrcCgaRt5JbfqgpyHh7WbG54MPrqvzyz10C52wCH8sFUhqaXNG2-M0", "token_uri": "<https://oauth2.googleapis.com/token>", "client_id": "1088850741773-2v0hh8m6a4j3f0164tu3v2ui9ubsimbm.apps.googleusercontent.com", "client_secret": "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", "scopes": ["<https://www.googleapis.com/auth/gmail.send>"], "universe_domain": "googleapis.com", "account": "", "expiry": "2024-11-23T04:38:16.729903Z"}

{"installed":{
    "client_id":"1088850741773-2v0hh8m6a4j3f0164tu3v2ui9ubsimbm.apps.googleusercontent.com",
    "project_id":"gmail-api-sender-442603",
    "auth_uri":"<https://accounts.google.com/o/oauth2/auth>",
    "token_uri":"<https://oauth2.googleapis.com/token>",
    "auth_provider_x509_cert_url":"<https://www.googleapis.com/oauth2/v1/certs>",
    "client_secret":"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"}}

Potentially this might help too

https://developers.google.com/gmail/api/guides?utm_source=chatgpt.com

https://developers.google.com/gmail/api/quickstart/js

https://developers.google.com/workspace/guides/get-started