In the scenerio you’re describing, is hellothere.com – the URL you’re redirecting to – is that on your Virtualmin server?
And just so that I understand what you’re after – what is it about redirecting using an HTML document or .htaccess that’s undesirable?
One option if both domains exist on your Virtualmin server, is to create the one server as an alias for the other. You can do that by going into Create Virtual Server, and choose to make an Alias Server.