Overview
This guide explains how to reissue and install a free basic SSL certificate from Let’s Encrypt for your domain in Plesk, including the wildcard subdomains (e.g., www, webmail).
Step-by-Step Instructions:
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Log in to Plesk: - 
Open your browser and log in to your Plesk panel using the provided credentials. 
 
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Select the Domain: - 
From the left-hand menu, go to Websites & Domains. 
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Select the domain you want to secure with SSL. 
 
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Open SSL/TLS Settings: - 
Under your selected domain, go to the Security section. 
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Click on SSL/TLS Certificates.  
 
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Reissue the Certificate: - 
Click the Reissue Certificate button.  
 
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Install Free Let’s Encrypt SSL: - 
Scroll down to the section titled: 
 “Install a free basic certificate provided by Let's Encrypt”
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Click the Install button.  
 
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Select Wildcard Options: - 
In the next screen: - 
Tick the checkbox for: 
 Secure the wildcard domain (including www and webmail)
 
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Click the Get it free button.  
 
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Complete Installation: - 
After the process completes, click the Continue button to finish. 
 
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Confirmation
You will see a confirmation message once the SSL certificate is installed. You can now access your website securely over HTTPS.
