Let’s Encrypt will revoke some SSL certificates on March 4, 2020

In 90 minutes from now Let’s Encrypt will begin to revoke approximately 2.6% of the SSL certificates that they have issued due to a issuance error.

This will affect a small number of Mail-in-a-Box instances.

To check if your SSL certificate is impacted, please visit the following website:


If that website is not responding or otherwise not available, run the following on the command line.

curl -XPOST -d 'fqdn=sub.mydomain.tld' https://checkhost.unboundtest.com/checkhost

Replace sub.mydomain.tld with the FQDN of your MiaB installation.

This will advise you if your certificate is impacted. If your certificate is revoked you will need to issue a new certificate manually. Please check back here for instructions on how to do so.

For code that is longer than one line, it is better to add 4 spaces before the code:

curl -XPOST -d 'fqdn=sub.mydomain.tld' https://checkhost.unboundtest.com/checkhost
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Rather than following the link - the key info is here:

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