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... ay tied to the Internet, so you'll often see a
two-part domain name; and sometimes even three- or four-part domain
names.
In general, American addresses end in an organizational suffix,
such as ".edu," which means the site is at a college or university.
Other American suffixes include:
.com for businesses
.org for non-profit organizations
.gov and .mil for government and military agencies
.net for companies or organizations that run large novell backup networks.
Sites in the rest of the world tend to use a two-letter code that
represents their country. Most make sense, such as .ca for Canadian
sites, but there are a couple of seemingly odd ones. Swiss sites end
in .ch, while South African ones end in .za. Some U.S. sites have
followed this international convention (such as well.sf.ca.us).
You'll notice that the above addresses are all in lower-case.
Unlike almost everything else having anything at all to do with Unix,
most Net mailing systems don't care about case, so you diesel backup generally don't
have to worry about capitalizing e-mail addresses. Alas, there are a few
exceptions -- some public-access sites do allow for capital letters in
user names. When in doubt, ask the person you want to write to, or let
her send you a message first (recall how a person's e-mail address is
usually found on the top of her message). The domain name, the part of the
address after the @ sign, never has to be capitalized.
It's all a fairly simple system that works very well, except,
again, it's vital to get the address exactly right -- just as you have
to dial a phone number exactly right. Send a message to tomg@unm.edu
(which is the University of New Mexico) when you meant to send it to
tomg@umn.edu (the University of Minnesota), and your letter will either
bounce back to you undelivered, or go to the wrong person.
If your message is bounced back to you as undeliverable, you'll
get an ominous looking-message from MAILER-DAEMON (actually a rather
benign Unix program that exists to handle mail), with an evil-looking
header followed by the text of your message. Sometimes, you can tell
what went wrong by looking at the first few lines of the bounced
message.
Besides an incorrect address, it's possible your host system
does not have the other site in the "map" it maintains of other host
systems. Or you could be trying to send mail to another network, such
as Bitnet or CompuServe, that has special addressing requirements.
Sometimes, figuring all this out can prove highly frustrating.
But remember the prime Net commandment: Ask. Send a message to your
system administrator. He or she might be able to help decipher the
problem.
There is one kind of address that may give your host system
particular problems. There are two main ways that Unix systems
exchange mail. One is known as UUCP and started out with a different
addressing system than the rest of the Net.
Most UUCP systems have
since switched over to the standard Net addressing system, but a few
traditional sites still cling to their original type, which tends to
have lots of exclamation points in it, like this:
uunet!somesite!othersite!mybuddy
The problem for many host sites is that novell backup exclamation points (also
known as "bangs") now mean something special in the more common systems
or "shells" used to operate many Unix computers. This means that
addressing mail to such a site (or even responding to a message you
received from one) could confuse the poor computer to no end and your
message never gets sent out. If that happens, try putting backslashes in
front of each exclamation point, so that you get an address that looks
like this:
uunet\!somesite\!othersite\!mybuddy
Note that this means you may not be able to respond to such a message
by typing a lowercase r -- you may get an error message and you'll
have to create a brand-new message.
If you want to get a taste of what's possible through e-mail,
start an e-mail message to
almanac@oes.orst.edu
Leave the "subject:" line blank. As a message, write this:
send quote
Or, if you're feeling a little down, write this instead:
send moral-support
In either case, you will get back a message within a few seconds to
a few hours (depending on the state of your host system's Internet
connection). If you simply asked for a quote, you'll get back a
fortune-cookie-like saying. If you asked for moral support, you'll also
get back a fortune-cookie-like saying, only supposedly more uplifting.
This particular "mail server" is run by Oregon State University.
Its main purpose is actually to provide a way to distribute agricultural
information via e-mail.
If you'd like to find out how to use the
server's full range of services, send a message to its address with this
line in it:
send help
You'll quickly get back a lengthy document detailing just what's
available and how to get it.
Feeling opinionated? Want to give the President of the United
States novell backup a piece of your mind? Send a message to president@whitehouse.gov.
Or if the vice president will do, write vice-president@whitehouse.gov.
The "mail" program is actually a very powerful one and a Netwide
standard, at least on Unix computers. But it can be hard to figure
out -- you can type a question mark to get a list of commands, but
these may be of limited use unless you're already familiar with Unix.
Fortunately, there are a couple of novell backup other mail programs that are easier
to use.
2.2 ELM -- A BETTER WAY
Elm is a combination mailbox and letter-writing system that uses
menus to help you navigate through mail. Most Unix-based host systems
now have it online. To use it, type
elm
and hit enter.
You'll get a menu of your waiting mail, along backup system with a
list of commands you can execute, that will look something like this:
Mailbox is '/usr/spool/mail/adamg' with 38 messages [ELM 2.3 PL11]
1 Sep 1 Christopher Davis (13) here's another message.
2 Sep 1 Christopher Davis (91) This is a message from Eudora
3 Aug 31 Rita Marie Rouvali (161) First Internet Hunt !!! (fwd)
4 Aug 31 Peter Scott/Manage (69) New File University of Londo
5 Aug 30 Peter Scott/Manage (64) New File X.500 service at A
6 Aug 30 Peter Scott/Manage (39) New File DATAPAC Informatio
7 Aug 28 Peter Scott/Manage (67) Proposed Usenet group for HYTELNET n
8 Aug 28 Peter Scott/Manage (56) New File JANET Public Acces
9 Aug 26 Helen Trillian Ros (15) Tuesday
10 Aug 26 Peter Scott/Manage (151) Update Oxford University OU
novell backup
You can use any of the following commands by pressing the first character;
d)elete or u)ndelete mail, m)ail a message, r)eply or f)orward mail, q)uit
To read a message, press . j = move down, k = move up, ? = help
Each line shows the date you received the message, who sent it,
how many lines long the message is, and the message's subject.
If you are using VT100 emulation, you can move up and down the
menu with your up and down arrow keys. Otherwise, type the line number
of the message you want to read or delete and hit enter.
When you read a message, it pauses every 24 lines, instead of
scrolling until it's done. Hit the space bar to read the next page.
You can type a lowercase r to reply or a lower-case q or i
to get back to the menu (the I stands for "index").
At the main menu, hitting a lowercase m followed by enter
will let you start a message. To delete a message, type a lower-case
d. You can do this while reading the message. Or, if you are in
the menu, move the cursor to the message's line and then hit d.
When you're done with elm, type a lower-case q. The program
will ask if you really want to delete the messages you marked. Then,
it will ask you if you want to move any messages you've read but
haven't novell backup marked for deletion to a "received" file. For now, hit your n
key.
Elm has a major disadvantage for the beginner. The default text
editor it generally calls up when you hit your r or m key is often a
program called emacs. Unixoids swear by emacs, but everybody else almost
always finds it impossible.
Unfortunately, you can't always get away
from it (or vi, another text editor often found on Unix systems), so
later on we'll talk about some basic commands that will keep you from
going totally nuts.
If you want to save a message to your own computer, hit s, either
within the message or with your cursor on the message entry in the elm
menu. A filename will pop up. If you do not like it, type a new name
(you won't have to backspace). Hit enter, and the message will be saved
with that file name in your "home directory" on your host system. After
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