I am so pleased with this tool and all it offers! Not only does it do everything I wanted, but the customer service is by far the best I've ever experienced!
I had trouble setting my domain up, and Jorge Moreno, the actual founder, not only spent as much time as it took me to fix it but he also regularly checked on me until the DNS records were correct and had fully propagated.
Mailrush so far is one of the most amazing deals I have bought on AppSumo and even outside of Appsumo. If you're hesitating about it, you need to stop and just get Mailrush because you won't be disappointed!