At Webmail.us we name all of our servers using hostnames that fall under a very generic domain name. I am not going to list that domain name here so that Google doesn’t index it in this blog post, but I’m sure you could figure it out if you wanted to.
The reason we use such a generic domain is because a large percentage of our business comes through resellers. And most of our resellers want their customers to think that the email service is entirely owned and operated by them – in fact we encourage this. Our resellers own the relationship with their customer, and we have no desire to interfere with that.
So we help them hide the fact that Webmail.us is powering their email hosting service by using generic server names everywhere, even in our reverse DNS. And if you were to check the WHOIS database for this domain you will see that all of the contact info references a third-party holding company named "Whois Privacy Protection Service, Inc."
Pretty slick, huh?