I want to enable webmail for one of my domains in Plesk 12.0.18. In Website & Domains → [my domain] → Mail Settings → Webmail, it does not offer any webmailer choices, it just says “The webmail component was not installed.” That’s a lie. I installed Roundcube and Horde in Plesk’s component manger. Uninstalling and reinstalling does not help. How can I fix this?