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 under Domains > example.com > SSL Certificates: selecting a certificate already used for securing webmail and hitting button "Secure Webmail" will freeze the interface.

We need it in PleskPanel also...

Please also add a checkbox to "Secure Mailing Lists Webinterface":
https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/10759350-request-to-add-ssl-tls-support-for-mailman-webinte

Great if Let's encrypt will be integrated for webmail as well..... :D

Please let us know when this has been implemented in the main branch.

Great suggestion. Something like this has to be automated.
https://www.lloyd-day.me/secure-plesk-webmails/

We need this future too.
Maybe Plesk can create let´s encrypt ssl-certificates for webmail.<customerdomain> at the time a new domain is created for an useraccount. Lets encrypt is implemented in Plesk and works finde. So no need for redirect from webmail.<customerdomain> to webmail.<configuredwebmailurl>

We need this feature too.

"Planned" now for over a year, which is really ... let's say "sad". Work-arounds and suggestions in the Plesk - forum should give the developpers enough informations, how to implement this suggestion into Plesk, so pls. Plesk - Team, get back to work and start the integration for this feature.

I need this as well

Letsencrypt Extension can provide valid SSL for domain.tld, I would like to use the same certificate for Webmail with URL https://domain.tld/webmail (without additional subdomain)

I use WILDCARD CERTS with IMAP but they are IP based and the procedure is very awkward and outside of PLESK
a. Also no SNI – so cannot do TLC_CF.domain.tld for all virtual hosts for COURIER-IMAP
2. No straightforward way to use WILDCARD cert for Webmail – Horde or Roundcube
3. How do I set up multiple domains with wildcard Certs – I have 3 IPs and each IP has multiple domains and each TLD has multiple subdomains so I want to configure Postfix to send mail for zebra@sub.dom1.tld from smtp.sub.dom1.tld etc

There are numerous servers on the web using multiple domains and subdomains on few IP addresses. Please implement wildcard SSL Certs and SNI built into Plesk user interface.

I solved this problem using Cloudflare. You just need to enable CF SSL on your webmail subdomain.

Please also allow letsencrypt Extension to do this job

Please add a configuration, that the Plesk-Hostname or Hostname/webmail are will display the webmailer

Similar to adding the following lines to /usr/share/psa-horde/login.php (which of course gets overwritten on Plesk upgrade):

if($_SERVER['SERVER_PORT'] != 443) { // Forces SSL
header("HTTP/1.1 301 Moved Permanently");
header("Location: https://".$_SERVER['HTTP_HOST']. $_SERVER['REQUEST_URI']);
exit();
}

very important for customers and security

same wish, thx

I am also looking for this feature.