How to secure the webmail with a Let's Encrypt certificate in Plesk

Question

How to secure the webmail with a Let's Encrypt certificate in Plesk?

Answer

Note: If the SSL It! extension is not installed on the server, the domain must have hosting enabled to be able to install a Let's Encrypt certificate.

Perform the following instructions:

1. Log in to Plesk GUI

2. Go to Subscriptions > example.com and make sure that a wildcard domain *.example.com or webmail.example.com are not present on the subscription.

   If any, rename or remove it, otherwise it'll not be possible to issue a Let's Encrypt certificate for webmail.example.com domain.

3. Issue the Let's Encrypt certificate including the webmail domain under to Domains > example.com > SSL/TLS Certificates > Install > Make sure the option Secure webmail on this domain is enabled > Get it free:

   Note: If it is required to secure other subdomains or domain aliases, make sure to select them

   Click here to see the image

    

4. Go to Domains > example.com > Mail Settings > Verify that the Let's Encrypt certificate is assigned in SSL/TLS certificate for webmail > Click OK to apply changes:
   
   Click here to see the image