What Is Email-based Deployment?

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During email-based deployment, a network administrator specifies uniform resource locator (URL) parameters in a deployment email to configure deployment information on the controller client and then sends the deployment email to a specified deployment mailbox. A deployment engineer then receives the deployment email and clicks the URL in the email to start the deployment process. Subsequently, devices automatically complete the deployment.

https://info.support.huawei.com/info-finder/encyclopedia/en/Email-based+deployment.html