RE: What the heck? Telnet to SMTP...

  • From: "Tiago de Aviz" <Tiago@xxxxxxxxxxxxxxx>
  • To: <exchangelist@xxxxxxxxxxxxx>
  • Date: Thu, 28 Jul 2005 14:36:02 -0300

I Guess PIX MailGuard is only good for generating trouble tickets ;)
 
Tiago de Aviz
SoftSell - Curitiba
(41) 3340-2363
www.softsell.com.br 
 
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>>> johnlist@xxxxxxxxxxxxxxxxxxx 28/7/2005 14:24 >>>

http://www.MSExchange.org/
And everyone thinks PIX are so great. John TeServices For You
 -----Original Message-----
From: Chris Wall [mailto:Chris.Wall@xxxxxxxxxxxxxxxxxxx] 
Sent: Thursday, July 28, 2005 8:59 AM
To: [ExchangeList]
Cc: [ExchangeList]
Subject: [exchangelist] What the heck? Telnet to SMTP...
http://www.MSExchange.org/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:
6.0.3790.211 ready at  Thu, 28 Jul 2005 11:53:55 -0400 When typing 'HELO'
or 'EHLO' I get the normal reply: helo250 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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