Give your comments on How to setup virtualdomain aliases here. Thanks in advance!
It would be good to add Daryl May's "How to set-up virtual domain e-mail aliases" along with this one into a complete Virtual Email Domain contrib for the Server-Manager. That way there would be a one stop shop to both. I will look at the possibilities, but since I am new to php, it will take me a while to create such a panel. * (comment)