email domain mapping/forwarding -- 2

Our company domain name ends with .fitness, which causes problems since some of the web-forms do not accept such domain extensions. Fortunately, we also own the [login to view URL] domain for our name. so if our domain is [login to view URL] (for mail we are using google apps), we also own [login to view URL] (only the domain - we have not setup any mail service on it yet). I would like a simple solution which will enable any email sent to abc(at) [login to view URL] to be automatically forwarded to abc @ [login to view URL] and so on. It should be a onetime solution and not recurring payment solution. Please let me know what information you will need from me to make this happen. Please specify clearly in your first line if you are going to implement a mail forwarding service - if so, my concern is I will have to manually enter info everytime a new user is created. I would prefer a service which simply forwards abc(at) [login to view URL] automatically to abc @ [login to view URL]