We are going to start Mail-4 Server Hsphere upgrade and before that we need to update the server OS level packages as well and to reflect change we need to reboot the server.
As an update Qmail service is running on the server now but Horde - webmail still have some configuration files issues and Parallels are working on it. In the mean while you can use SquirrelMail as a webmail client.
We are going to start Mail-5 Server Hsphere upgrade and before that we need to update the server OS level packages as well and to reflect change we need to reboot the server.