Can this service be used for internal web sites that are not accessible from outside the domain

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Hello @sparksjoseph and @Kurgen, welcome to the Let's Encrypt community. :slightly_smiling_face:

Let’s Encrypt offers Domain Validation (DV) certificates.

For Let’s Encrypt to issue a Domain Validation (DV) certificate Domain Validation must happen
and it is a CA/Browser Forum Baseline Requirement .

Please read Certificates for localhost - Let's Encrypt

Also if you have a Domain Name you can get Certificates issued via the DNS-01 challenge of the Challenge Types - Let's Encrypt
DNS providers who easily integrate with Let's Encrypt DNS validation

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