The Online World resources handbook

Electronic mail, telex, and fax http://home.eunet.no/~presno/bok/7.html
build X500 based directories.
Information contained in LDAP databases include vital data such as name and
e mail address, and may include supplemental data including address, phone, fax, and
even the person's public key which can be used to encrypt messages the user is sending
them. For more information, see the LDAP home page.
Supplement by checking the "How to find people's E mail addresses FAQ".
Domain name addressing
On the Internet, the general form of a person's email address is:
user name@somewhere.domain
My main, international Internet mailbox address is:
presno@eunet.no
Read the address from left to right. First, the local name of the mailbox (my name
abbreviated). Next, there is sometimes the name of the mailbox system or another
identification code (previously, I had "login" in this position of my mail address),
followed by the name of the institution or company (here "EUnet, a Norwegian Internet
provider), and finally the country ("NO" for Norway).
People have sent mail to my mailbox from New Zealand, Zimbabwe, Guatemala,
Peru, India, China, Greece, Iceland, and Armenia using this address.
Some of them had to send their mail through a gateway to the Internet, and the
address sometimes had to be changed accordingly:
Users of AppleLink used presno@eunet.no@INTERNET# . Those on JANET used
presno%login.eunet.no@eanrelay.ac.uk. On SprintMail, they used ("RFC 822":
, SITE:INTERNET) . CompuServe subscribers used
INTERNET:presno@eunet.no . (These procedures may have changed now!)
The core of these address formats is "presno@eunet.no," in one way or the other.
We call the core addressing format a Domain Naming System. "EUNET.NO" is a
domain. The domain may also contain reference to the name of a company or
organization, as in compuserve.com, twics.co.jp, or IGC.ORG. The .CO, .COM, and
.ORG codes identify IGC, TWICS, and CompuServe as companies or organizations.
To send mail from the Internet to my CompuServe mailbox, use (do not expect a
reply, as I'm rarely there!):
75755.1327@compuserve.com
Normally, a domain address can only contain one @ character. When an address has to
be extended with gateway routing information, replace all @ characters to the LEFT in
WKH DGGUHVV E\ FKDUDFWHUV +HUH LV DQ H[DPSOH
USER%SYSTEM.BITNET@CUNYVM.CUNY.EDU
The rightmost @ in this address is maintained. The one to the LEFT has been replaced
with a %. The term ".BITNET" tells the gateway machine where to forward the
message.
The following used to happen with this address: First, the message was sent to
system CUNYVM at the EDUcation site CUNY. CUNYVM investigated the address,
and discovered that it was for BITNET. It cut off all text to the right of "USER," and
replaced the % with an @. The message was forwarded to mailbox USER on the
BITNET system SYSTEM. Replace USER and SYSTEM with your real addressing data.
How to get a personalized domain name?
If you're a small business, you may like to have a personalized
domain name like the big ones. Microsoft uses microsoft.com, IBM uses
ibm.com, HotBot uses hotbot.com, and it sure would be nice to have your
own yourname.com.
For cost efficient ways of getting a personalized domain name, check
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