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

  • From: "Chris Wall" <Chris.Wall@xxxxxxxxxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Thu, 28 Jul 2005 14:57:37 -0400

http://www.MSExchange.org/


No - it's not necessarily the PIX's fault.  More like the admin that enabled 
the feature without first talking to the E-mail admin...

 

Funny how everyone else's security tactics can negatively effect e-mail - and 
when it does the e-mail admin gets the black eye because it is generally the 
only service that gets noticed when it breaks.

 

Alright, enough of my ranting and back to my 'easy' e-mail duties :-)

 

 

 

________________________________

From: Tiago de Aviz [mailto:Tiago@xxxxxxxxxxxxxxx] 
Sent: Thursday, July 28, 2005 1:36 PM
To: [ExchangeList]
Subject: [exchangelist] RE: What the heck? Telnet to SMTP...

 

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 T

eServices 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: 6.0.3790.21

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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