On Sun, 04 Feb 2001 00:06:03 -0500,
"Glenn McCorkle" <[EMAIL PROTECTED]> wrote:
>
> On Sat, 03 Feb 2001 12:52:32 +0000, Samuel W. Heywood wrote:
>
> <snip>
>
> > authentication protocol, but unless you are connected to "shentel.net" I
> > don't think there is any way you can send a message out of
> > "smtp.shentel.net" unless you have obtained some subscriber's username and
> > password and have used this information to illegally log in to "shentel.net"
Correct. That is how most most closed relays work. Only those connected
to the ISP's network can send mail out. This is based on IP address.
However, in order to accommodate "roaming" users, ISP's and email
services have come up with other methods to authenticate these users.
Some, like crosswinds.net, will let anyone relay as long as they use
a crosswinds mail_from address, which is why they find themselves in
ORBS. Others use POP-before-SMTP or SMTP auth.
I don't think that ESMTP has anything to do with it other than
allowing the server to use SMTP auth, but it doesn't have to.
> Shall we test that? ;-)
>
> I have reconfigured to use "smtp.shentel.net"
#host -t mx shentel.net
shentel.net mail is handled (pri=10) by norm.shentel.net
I think if you try the test again using norm.shentel.net, you'll
get a different result. :-)
> Here is the smtp.log created by Arachne when I tried to send this
> message to [EMAIL PROTECTED]
>
> - ----smtp.log---
> 220 stingray.shentel.net ESMTP Sendmail 8.11.1/8.11.1; Sat, 3 Feb 2001 23:56:59
> - -0500
> HELO cisnet.com
> 250 stingray.shentel.net Hello pm3111.cisnet.com [207.17.248.111], pleased to
> meet you
> MAIL FROM: <[EMAIL PROTECTED]>
> 250 2.1.0 <[EMAIL PROTECTED]>... Sender ok
> RCPT TO: <[EMAIL PROTECTED]>
> 550 5.7.1 <[EMAIL PROTECTED]>... Relaying denied
> QUIT
Good. This is exactly what one would expect when trying to send
mail through any closed relay.
> - ---smtp.log---
> 220 stingray.shentel.net ESMTP Sendmail 8.11.1/8.11.1; Sun, 4 Feb 2001 00:05:49 -0500
> HELO cisnet.com
> 250 stingray.shentel.net Hello pm3111.cisnet.com [207.17.248.111], pleased to meet
>you
> MAIL FROM: <[EMAIL PROTECTED]>
> 250 2.1.0 <[EMAIL PROTECTED]>... Sender ok
> RCPT TO: <[EMAIL PROTECTED]>
> 550 5.7.1 <[EMAIL PROTECTED]>... Relaying denied
> QUIT
Something's not right here. If this is Sam's mailserver, how can
anyone send him e-mail? So, try "RCPT TO: <sheywood>" in the above
or use norm.shentel.net
#telnet norm.shentel.net 25
Trying 204.111.2.35 ...
Connected to norm.shentel.net.
Escape character is '^]'.
220 norm.shentel.net ESMTP Sendmail 8.11.2/8.11.2;
Sun, 4 Feb 2001 06:45:44 -0500
helo nyx10.nyx.net
250 norm.shentel.net Hello nyx10.nyx.net [206.124.29.2], pleased to meet you
mail from:<[EMAIL PROTECTED]>
250 2.1.0 <[EMAIL PROTECTED]>... Sender ok
rcpt to:<[EMAIL PROTECTED]>
250 2.1.5 <[EMAIL PROTECTED]>... Recipient ok
quit
Howard E.
--
DOS TCP/IP * <URL:http://www.ncf.ca/~ag221/dosppp.html>
