Integrating Yahoo Mail with Odoo using OAuth is feasible, even though Yahoo has removed basic password-based authentication. You can set up OAuth for Yahoo by following these steps:

1. Understand Yahoo’s OAuth Requirements

Yahoo supports OAuth 2.0 for third-party application access. To use OAuth with Yahoo in Odoo, you must:

• Register your application with Yahoo Developer Console.
• Obtain the client_id and client_secret for OAuth.
• Configure Odoo's email settings to use Yahoo's IMAP/SMTP servers with OAuth tokens.

2. Register Your Application in Yahoo Developer Console

1. Create a Yahoo Developer Account:
   • Go to the Yahoo Developer Network.
   • Sign in with your Yahoo credentials.
2. Create a New Application:
   • Click on My Apps and select Create an App.
   • Provide the following:
     • Application Name: A name for your app (e.g., "Odoo Email Integration").
     • Redirect URI: Use https://localhost for testing or provide Odoo's redirect URL in production, such as https://your-odoo-domain.com/auth_oauth/signin.
     • Permissions: Select Mail, Contacts, and Calendar for access.
3. Save and Obtain Credentials:
   • After saving, Yahoo will generate a Client ID and Client Secret. Note these for later configuration in Odoo.

3. Configure OAuth in Odoo

1. Install OAuth2 in Odoo:
   • Ensure the auth_oauth module is installed in Odoo.
   • Go to Settings > Integrations > OAuth Providers.
2. Add Yahoo as an OAuth Provider:
   • Click Create and configure:
     • Provider Name: Yahoo
     • Client ID: Use the Client ID from Yahoo Developer Console.
     • Client Secret: Use the Client Secret.
     • Redirect URI: Ensure it matches the URI registered in Yahoo.
     • Scope: openid mail.
     • OAuth Endpoint URLs:
       • Authorization URL: https://api.login.yahoo.com/oauth2/request_auth
       • Token URL: https://api.login.yahoo.com/oauth2/get_token
3. Test the Configuration:
   • Verify that the OAuth flow is working by testing the connection.

4. Configure Yahoo IMAP/SMTP in Odoo

1. Yahoo IMAP/SMTP Settings with OAuth:
   • IMAP Server: imap.mail.yahoo.com
   • IMAP Port: 993
   • SMTP Server: smtp.mail.yahoo.com
   • SMTP Port: 465
2. Use OAuth Tokens in Odoo:
   • Go to Settings > Email > Outgoing Mail Servers (for SMTP) or Incoming Mail Servers (for IMAP).
   • Add Yahoo as a mail server and use the following:
     • Username: Your Yahoo email address.
     • Authentication Method: OAuth2.
     • Access Token: Generated during the OAuth flow.

5. Troubleshoot and Test

• Ensure Yahoo’s OAuth credentials are correctly set up in both Yahoo Developer Console and Odoo.
• Test the email flow by sending a test email from Odoo.
• Verify IMAP integration by fetching emails.

Key Notes

• Yahoo’s Security Requirements: Yahoo enforces secure access, so ensure your application uses HTTPS for OAuth callbacks in production.
• Access Token Refresh: Odoo's OAuth implementation should handle token refresh automatically. Verify this during testing.
• SMTP Authentication Error: If you encounter an error, ensure the app has the correct permissions and OAuth is configured properly.