Let's Encrypt not for webmail???

I was pleasantly surprised by the ease of use of the "Let's encrypt" integration in Plesk. Then I thought of the webmail where this would even be nicer and more necessary as we recommend our customers to use "http://webmail.<yourdomain>" to access their mail.

Will there be a "Let's encrypt" for that soon or doesn't "Let's Encrypt" provide certificates for webmail.*.* domain names??

JP

PS (can this post be moved to the Onyx thread?)