Symptoms
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After the automatic Let's Encrypt renewal process finishes, the certificate for mail.example.com is not updated, and the following message is displayed:
Let's Encrypt does not support mail certificate auto-renewal. To renew the mail certificate automatically, install the SSL It! extension.
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SSL It! extension is not installed under Extensions > My Extensions > SSL It! page.
Cause
Standalone version of Let's Encrypt does not support auto-renewal of mail certificates.
Resolution
- Log into Plesk.
- Install SSL It! extension.