How To Use Certbot Standalone Mode to Retrieve Let's Encrypt SSL Certificates
[Let’s Encrypt](https://letsencrypt.org/) is a service that offers free SSL certificates through an automated API. The most popular Let’s Encrypt client is [EFF](https://www.eff.org/)’s [Certbot](https://certbot.eff.org/) client. Certbot offers a variety of ways to validate your domain, fetch certificates, and automatically configure Apache and Nginx. In this tutorial, we’ll discuss Certbot’s [standalone mode](https://certbot.eff.org/docs/using.html#standalone) and how to use it to secure other types of services, such as a mail server or a message broker like [RabbitMQ](https://www.rabbitmq.com/).
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