Name servers. Most registrars provide two or more name servers as part of the registration service. However, a registrant may specify its own authoritative name servers to host a domain's resource records. The registrar's policies govern the number of servers and the type of server information required. Some providers require a hostname and the corresponding IP address or just the hostname, which must be resolvable either in the new domain, or exist elsewhere. Based on traditional requirements (RFC 1034), typically a minimum of two servers is required.
The cloud certainly makes delivering email to your users easier but, for the vast majority of organizations, there's still going to be some setup required beyond simply activating the service. At a minimum, a domain must be purchased and configured to point to the new email host. The service provider can make this process very simple or they can make quite hard; this is something you should watch for in the provider's customer support forums as well as in our reviews. In most cases, there is a validation phase that will require some technical familiarity, though a few providers go so far as to walk even neophyte users through it step by step. Other solid services bolster excellent support with tutorial articles and videos that also walk you through the process. The worst will leave you to figure it out on your own.
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. 

A great domain name is a concise, easy to type, and memorable URL that reflects your brand or your website’s subject matter. Avoid using hyphens, strings of numbers, or unnecessary words to make it easy for your visitors to remember and find your website. Remember: A great domain name is one that your visitors can type correctly on their first try.
A fully qualified domain name (FQDN) is a domain name that is completely specified with all labels in the hierarchy of the DNS, having no parts omitted. Labels in the Domain Name System are case-insensitive, and may therefore be written in any desired capitalization method, but most commonly domain names are written in lowercase in technical contexts.[2]
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