As I understand it, ESMTP (that is, enhanced simple mail transfer protocol)
is relevant to our discussion, because ``unenhanced'' SMTP does not
include the AUTH command. If you telnet to a mail host and enter:
HELP <ENTER>
you see a list of possible SMTP commands the server will accept. You
need ESMTP to include the ``enhanced'' command AUTH.
Again as I understand it, AUTH is supposed to work thus: Any one and
any other mailserver can access a mail server that uses AUTH. If
do not or cannot authenticate yourself, using the AUTH command, you
can send mail ONLY to users whos email address is within the ISPs
``REALM''. If you want to use the mail server to send mail to destinations
outside the realm, you must authenticate.
Thus, any software and any person can send Sam Heywood mail, without
authentication, if Sam is a customer of the ISP that includes,
shentel.net. But, nobody but a verio customer, who is authenticated
with AUTH, can send Sam the same email, using the mail server:
smtp.veriomail.com
try it and you will get prohibited!
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