Use an authentication provider for external SMTP
Configure Workflow external SMTP to use an existing OAuth authentication provider.
Before you configure external SMTP to use OAuth, make sure that you have already created an OAuth authentication provider in Workflow. For instructions, see Add an authentication provider for Workflow.
When you configure external SMTP settings in Workflow and select OAuth as the SMTP mechanism, you can reuse a stored OAuth credential instead of entering credentials directly in the SMTP configuration.
To use an authentication provider for Workflow external SMTP: