Authenticate without website

Is there a way to authenticate without having a website? I need certificates for email servers and I don’t have any pull with the website folks to get their ISP to make the changes.

Is there some other way using DNS or the like?


Yes, you can use the dns-01 challenge. You can read more about the different challenge types here:

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Hi @OsoRojo

do you control

If yes, create there a webserver. Or use Certbot with --standalone.

Or use dns validation. Then you don’t need a running webserver and you don’t need a public ip address.

But if you have a mail server, you have already a public ip address, so it’s easy to add a temporary webserver (start - stop before after renew).

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