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
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:
If the domain includes a department, the convention is:
Here is a description of each of the domain levels:
A top-level domain is an officially registered name that
describes the purpose of a group of institutions or a code
that is associated with a country.
You can only use registered top-level and subdomain names if
you have registered your organization with SRI
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
The International Standards Organization (ISO)
standard 3166 defines the country codes.
For example, US is the country code for the
United States, AU for Australia, DK
for Denmark, and JP for Japan.
educational and research institutions
a domain name where users transmit information
between cooperating neighbor machines via UUCP
An officially registered name that describes a company,
department, or any subgroup under a top-level domain;
company_name is an example of a subdomain in the domain
A name recognized only within an organization that has
meaning only within that organization; a department name
such as engr is an example of a local domain.
Registering domain names
Modifying domain parameters
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003