Is it possible to set up our own webmail systems, so that we can fully customise and brand them as resellers?
If so, how does this work, with existing users etc. Or do we set it up, and create a new database which stores users in. Which I assume would have to be manually entered.
For that you would have to rely on the documentation and support of the webmail system you are installing. As for the HSphere side of things, I would assume you could find it in the HSphere docs. But I haven’t actually looked.
Bored_admin, generally for each webmail, you need to setup its web interface and its backend to store preferences. Just follow their docs and do the install. You may even do a local install, test and upload.
There is no need for 3 webmail, one for each server. You can set one that allows to select servers. I’m sure many are already using it this way.
Also, forums are not the primary mode of support and thus not all posts may be replied by the support staff.