Your question is a fairly technical one and I'll explain
how this works. I'll try not to make it over your head.
Please see me responses embedded in your message.
At 02:11 PM 4/10/98 -5, Jeff Cochrane wrote:
>Anthony Brooks writes:
>> Technically speaking, anyone who is communicating (transmitting or
>> receiving) data using a device that has an Internet Protocol
>> address is on the Internet. That is, all devices communicating
>> over the Net has a unique IP address. If you do not have one, you
>> can not be a "member" on the Net and use its services.
>Do all Internet services require the user to have an IP number? When
>I send an email, for example, does the receiving system need to know
>my IP number, or simply the IP number of my SMTP server?
Yes. ALL (as in every) computer (or communicating device) on the Internet
has to have an IP address. There are no exceptions. However, you may not
know what your address your computer uses because this is meant to be
transparent to you.
To address email, no, the receiving end-user computer doesn't necessarily need
to know the sender's IP address. But the receiving mail server does. Suppose
you send mail to an person who no longer valid email address, but, the domain
name is still valid (I'm assuming you know what a domain name is). Well, the
mail can not be delivered. How do you think you get one of those "bounced
messages" telling you that your mail was not delivered? There is no way you
could received the notice without having a unique IP address for your computer
and the remote email server knowing your computer's IP address and your email
Now one thing I did not say: IP address are the same as email address. In
fact an email address contains as a portion of it an IP address but it has
An IP address just tells everyone in the Internet community (world-wide) where
you are and how to get to you on the Net. Think of an IP address as the
of your home. Your home has a unique address that no one else in the world
Therefore, if someone from Cape Town, SA sends you a postal letter and has you
correct address, you will get the letter (how long it takes is another
matter). :) The same applies to computer on the Internet. Your IP address
even act as your telephone number too. If someone wants to log onto your
computer (using telnet)
or send your a file (using ftp), they use your IP address to get to you.
servers use IP address to send mail as well.
I'm trying to give you a high level feel for how this stuff works by using
Hopes this helps.
>Jeff @ Washington
>[log in to unmask]
>1111 North 19th Street Suite 210
>Arlington, VA 22209 USA
>Tel 1-703-235-5415 Fax 1-703-235-3805
Anthony (Tony) Brooks
Software & Data Communications Specialist
NuTek 2000, Inc. Voice: 703/861-8325
PO Box 554 Fax: 703/406-3021
Herndon, VA 20172 mailto:[log in to unmask]