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Is it possible to install a Let's Encrypt certificate for many domains at once?
It is possible to keep all domains secured with Let's Encrypt certificate by performing the following steps:
Go to Service Plans.
On a Hosting Plans tab, either click Add a Plan to create a new plan or click the name of an existing plan to edit it.
Go to the Additional Services tab and select Keep websites secured with free SSL Certificate under SSL It!:
Click OK or Update & Sync.
After that, all domains, subdomains, domain aliases, and webmail that belong to subscriptions based on this hosting plan will be automatically secured with Let’s Encrypt certificates. This change affects both existing and newly created subscriptions.
When this feature is turned on for a hosting plan, self-signed or expired SSL/TLS certificates are replaced with a Let’s Encrypt certificate, for every domain, subdomain, domain alias, or webmail that belongs to a subscription based on that hosting plan.