How to secure webmail using Let's Encrypt in Plesk Onyx

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    Marco Marsala (Edited )

    You should place a redirect from http://webmail.domain.tld to https. Even the option "Hosting Settings > Permanent SEO-safe 301 redirect from HTTP to HTTPS" won't redirect the webmail; in any case these should be two separate options as the website may not support HTTPS yet.

    There is an UI bug too: selecting a certificate already used for securing webmail and hitting "Secure webmail" will freeze the interface.

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    Konstantin Annikov (Edited )

    Hello, 

    There is no "redirect to https for webmail" feature in Plesk yet, but you can vote for it on UserVoice portal: 
    https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/18515065-possibility-to-force-ssl-on-webmail

    And as a workaround, you can force https connection in Roundcube configuration file as it described here

    Or use the following article to make a redirect on the level of Apache: 
    How to redirect webmail HTTP to HTTPS

    As for the UI, I could not reproduce the same on my test server with newly installed Plesk Onyx 17.5. The following notification is shown after selecting the certificate which is already used for securing webmail on domain: 

    PLESK_INFO: The webmail was secured with the selected certificate. Important: webmail now works via HTTPS only, correct your bookmarks, links, and so on.

    So, please  submit a ticket for support in order to check if the issue persists on your server: 

    How to submit a request to Plesk Technical Support

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