Note that Google has a very complicated process to migrate an IMAP/SMTP app to OAuth. There is a long list of requirements to register an OAuth client for these

Note that Google has a very complicated process to migrate an IMAP/SMTP app to OAuth. There is a long list of requirements to register an OAuth client for these protocols: https://developers.google.com/terms/api-services-user-data-policy#additional_requirements_for_specific_api_scopes https://developers.google.com/terms/api-services-user-data-p...