You build an n8n webhook-to-email automation by setting up a Webhook node as a trigger, connecting it to a Send Email node, and mapping the incoming POST data to email fields using expressions like {{ $json. body. email }} .
Source: [Dev.to](https://dev.to/samchenreviews/n8n-webhook-to-email-tutorial-build-instant-form-to-inbox-automation-1h12)