No, domains first have to be registered and thereby be unlocked on the central e-mail entry .
For this purpose you can find the product "Modul E-Mail-Routing" in the category "RWTH-E-Mail" in the IT-Shop. It can be obtained free of charge by the holder of the role IT-purchaser. If your institute does not have anyone who holds this role, e.g. student dorms, please contact the IT-ServiceDesk. By obtaining the product, your institute receives a filter configuration fitted to the delivering e-mail system. This facilitates a rate limiting of the central e-mail routing structures of RWTH Aachen University and protects them from abuse.