Yes
Hostnames that include DNS domains are often stored in the Domain Name System together with the IP addresses of the host they represent for the purpose of mapping the hostname to an address, or the reverse process. In the latter form, a hostname is also called a domain name. If the domain name is completely specified, including a top-level domain of the Internet, then the hostname is said to be a fully qualified domain name (FQDN). Example of an email address. An email address identifies an email box to which email messages are delivered. A wide variety of formats were used in early email systems, but only a single format is used today, following the standards developed for Internet mail systems since the 1980s.  To the left of the '@' sign is the user name. It designates who at a domain is the owner of an email address, for example me. If it was not assigned to you by your school or employer (or friend), you can choose the user name freely. When you sign up for a free email account, for example, you can enter your own creative user name. You are not completely free, however. In fact, the number of characters that can be used the user name part of email addresses is literally numbered about is an example of such a custom domain name. The domain owner can then set up sub-level domains freely, to form something like boetius.example.com. Unless you buy your own domain, you don't have much say (or even choice) concerning the right, the domain name part of your email address. It designates who at a domain is the owner of an email address, for example me. If it was not assigned to you by your school or employer (or friend), you can choose the user name freely. I'm trying to set up a domain name, but I'm having problems. Most of the names I would like to use are already taken. I know you can use an underscore (_) in a domain name and a dash (-). Are there any other special characters I can use. Specifically, I'd like to use the single quote (') to use Amelia's. Thanks, Amelia. Discussion is locked. Flag. Permalink. The posting of advertisements, profanity, or personal attacks is prohibited Hostnames may be simple names consisting of a single word or phrase, or they may be structured. On the Internet, hostnames may have appended the name of a Domain Name System (DNS) domain, separated from the host-specific label by a period (dot). In the latter form, a hostname is also called a domain name. If the domain name is completely specified, including a top-level domain of the Internet, then the hostname is said to be a fully qualified domain name (FQDN). Posts: 20,938. The underLINE you're seeing with the email address is either because it is a link on a webpage/email, or because it has been underlined in HTML-the underline is NOT part of the actual address that you have to fill in. However, an underSCORE is like a hyphen, only it's at the bottom of the character space. ninja is correct that an underscore is a legal character, but it should not be interpreted as a substitute for a hyphen. That is, if the correct email address has a hyphen, substituting an underscore should not work since both hyphens and underscores are legal characters. Did you know that you can set up email accounts from your own domain using the power of the user-friendly Gmail browser-based email system? This means you can have any email address you want provided you own the domain name, and you’ll be able to access it from anywhere a browser is handy. Setting it up is a little intimidating, but if you follow these steps, you should be in the clear. (And you only have to set it up once!). On the Internet, a hostname is a domain name assigned to a host computer. This is usually a combination of the host's local name with its parent domain's name. For example, en.wikipedia.org consists of a local hostname (en) and the domain name wikipedia.org. This kind of hostname is translated into an IP address via the local hosts file, or the Domain Name System (DNS) resolver. In the latter form, a hostname is also called a domain name. If the domain name is completely specified, including a top-level domain of the Internet, then the hostname is said to be a fully qualified domain name (FQDN).
https://en.wikipedia.org/wiki/Hostname https://en.wikipedia.org/wiki/Email_address http://email.about.com/cs/standards/a/email_addresses.htm http://email.about.com/cs/standards/a/email_addresses.htm http://www.cnet.com/forums/discussions/what-special-characters-can-you-use-in-a-domain-name-271485/ https://en.wikipedia.org/wiki/Hostname http://boards.straightdope.com/sdmb/showthread.php?t=93147 http://www.coffeecup.com/help/articles/set-up-gmail-for-your-own-domain/ https://en.wikipedia.org/wiki/Hostname
can you have a underscore in an email domain address name