Domain mapping: 301 Redirect for second domain going to network and not mapped domain


I've got the Domain mapping plugin to work fine by mapping the domain name to

However, I now need to set up a 301 redirect from our secondary domain name to

Everything looks fine in the cPanel, but when we type into the web browser it redirects to the top level URL for the whole network ( - which doesn't have anything on it at the moment).

How do I get the .com to redirect to the right place?

If someone could get back to me about this quickly you would be totally saving my ass