You can setup for all emails to also deliver to a 2nd mailbox inside SiteWorx. You can also setup more advanced stuff on shell. You can also setup groups where and email set to group1@xxx.com would go to several individual email address.
You would then need to make one for the mainemail b/c i think it would get stuck in a loop if you didn’t (if mainemail is in the same domain as the others that is)