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A ``domain name'' is the section of a mail address that
appears to the right of the at (@) character,
for example, your_company.com.
The domain name describes the site where a machine is located
and generally includes the machine (host) name, a department
(optionally), and the site's organization or country.
MMDF uses the domain name to deliver the message to the
appropriate location.
Domain names can be either upper or lowercase;
MMDF is case-insensitive when evaluating domain names.
Note that the domain name uniquely identifies a machine,
but not the path by which messages reach that machine.
This is the convention for specifying domains:
hostname.subdomain.top-level
If the domain includes a department, the convention is:
hostname.local.subdomain.top-level
Here is a description of each of the domain levels:
You can only use registered top-level and subdomain names if you have registered your organization with SRI International. For information on registering your domain, see ``Registering domain names''. If you have not registered with SRI, use the UUCP top-level domain.
In the United States, the common top-level domains on the Internet are: