Re: FW: What the heck? Telnet to SMTP...
- From: "Paul Lemonidis \(Hotmail\)" <paul_lemonidis@xxxxxxxxxxx>
- To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
- Date: Thu, 28 Jul 2005 17:21:13 +0100
Hi Chris
Yes. You are right. This is standard for mail servers published through a Cisco
PIX.
Regards,
Paul Lemonidis.
----- Original Message -----
From: Chris Wall
To: [ExchangeList]
Sent: Thursday, July 28, 2005 5:03 PM
Subject: [exchangelist] FW: What the heck? Telnet to SMTP...
http://www.MSExchange.org/
Never mind - I think the PIX is the culprit. Time to have a little talk
with the Network Admin J
See here for info - http://www.mcse.ms/message1257982.html
Chris
------------------------------------------------------------------------------
From: Chris Wall
Sent: Thursday, July 28, 2005 11:59 AM
Cc: [ExchangeList]
Subject: What the heck? Telnet to SMTP...
Hello all,
I have a weird one here. I have two SMTP Gateway boxes for our organization.
One is Win 2003 Server with IIS and the other is Win 2000 Server with IIS.
Neither of these servers have Exchange installed, but they do act as Smart
Hosts for our Exchange 2003 environment.
I have just found out that when someone (externally) attempts to telnet to
our SMTP hosts (206.195.131.20 and 206.195.131.69) the following appears:
220
*******************************************************************0****0*2******************2******200********0***0*00
If I attempt to type 'EHLO' or 'HELO' I receive the following:
500 5.3.3 Unrecognized command
If I attempt to telnet to these servers from an internal PC, using the
internal IP address, I get the standard:
220 mail1.globalknowledge.com Microsoft ESMTP MAIL Service, Version:
6.0.3790.21
1 ready at Thu, 28 Jul 2005 11:53:55 -0400
When typing 'HELO' or 'EHLO' I get the normal reply:
helo
250 mail1.globalknowledge.com Hello [172.16.5.181]
Mail is flowing as it should into our organization, but I am unable to
successfully force a Telnet Session to our servers from an external computer.
In the past, our servers have responded to telnet requests as if internal, but
now they respond with '220 *************' etc.
What could be causing this since I have not made any changes to the IIS SMTP
config?
Any help is greatly appreciated.
Chris
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