You might consider iRedMail. It's not a service, but it's super easy to set up. It bundles all the top mail services in one easy installer and provides their ow

You might consider iRedMail. It's not a service, but it's super easy to set up. It bundles all the top mail services in one easy installer and provides their own custom admin webapp (the simple admin is free... the advanced admin is how they make money). You can add multiple domains after the installation process. They'll make you create an initial super user on some domain during installation but you can delete it later. http://iredmail.org/ http://iredmail.org/