Horde Webmail
The Horde is a free web-based groupware. The users manage and organize email messages easily with Horde webmail. The PHP-based framework can provide all the elements required for rapid web application development. Horde webmail has its features such as calendar, notebook, address, and contacts. The following command is used to enable Horde webmail on the mail server using Plesk.
Command:
mailserver --update-webmail horde -state true