OAUTH2 explained

[Costas]

• Google present it as
• 
• Microsoft present it as
• 

ref - https://github.com/robocorp/example-oauth-email

• Limi labs
  • OAuth 2.0 with Office365 (microsoft IMAP / POP3 connectivity analyzer)
  • OAuth 2.0 with Gmail
• EmailArchitect
  • Retrieve email using Gmail OAuth 2.0
  • Retrieve email using Microsoft OAuth 2.0
• Aspose - OAuth 2.0 API Access to Google Services

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Python app - email-oauth2-proxy - An IMAP/POP/SMTP proxy that transparently adds OAuth 2.0 authentication for email clients that don't support this method.

Python app - Gmailtail - Command-line tool to monitor Gmail messages and output them as JSON.

Delphi library - Microsoft365-4D - for Microsoft 365 integration. OAuth2 with PKCE, Mail, Calendar, Contacts, and SharePoint via Microsoft Graph API.