A few companies have offered low-cost, below-cost or even free domain registration with a variety of models adopted to recoup the costs to the provider. These usually require that domains be hosted on their website within a framework or portal that includes advertising wrapped around the domain holder's content, revenue from which allows the provider to recoup the costs. Domain registrations were free of charge when the DNS was new. A domain holder may provide an infinite number of subdomains in their domain. For example, the owner of example.org could provide subdomains such as foo.example.org and foo.bar.example.org to interested parties.
One great way to protect data is by using email encryption. This feature can do wonders for protecting your organization's privacy and that of your employees, but it demands some investigation when you're selecting your provider. Is it built-in or do you require a third-party tool? Does it use common standards that the recipient can process? What about Secure Sockets Layer (SSL) certificates? Are they included or do they need to be purchased separately? The best-in-class tools will not only make encryption easy for anybody to configure and use, buy they'll also make it easy for you to understand pre-purchase.
One of the most important compatibility factors to consider with email is the mobility question. How often do your employees need to access email via mobile devices? That's an important issue because most email hosting providers deliver some kind of web client usable as a default inbox. Almost all of these can be accessed via a mobile device, so if your employees don't need to access their emails on the road that much, then such mediocre clients are probably fine.