RE: how to block SMTP Commands without ISA Server
- From: "Mark Fugatt" <mark@xxxxxxxxx>
- To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
- Date: Wed, 3 Dec 2003 14:29:16 -0500
No, a lot of the time you would test connectivity from the outside and the
inside to ensure that its not a firewall issue that could be causing
connectivity issues.
Mark Fugatt
MCT, MCSE, Microsoft Exchange MVP
Pentech Office Solutions Inc
Tel: 585 586 3890
Cell: 585 576 4750
Fax: 585 249 0316
MSN IM: mark@xxxxxxxxx
www.4mcts.com
www.exchangetrainer.com
-----Original Message-----
From: Gabrie van Zanten [mailto:gabrie@xxxxxxxxxxxxxxxx]
Sent: Wednesday, December 03, 2003 2:09 PM
To: [ExchangeList]
Subject: [exchangelist] RE: how to block SMTP Commands without ISA Server
http://www.MSExchange.org/
Yes that is correct, it would.
On the other hand, you would in most cases test your smtp connection from
the inside. And if you were going to test it from the outside, simply
disable this feature. In raptor it can be done on the fly (from the inside).
Gabrie
> -----Original Message-----
> From: John Tolmachoff (Lists) [mailto:johnlist@xxxxxxxxxxxxxxxxxxx]
> Sent: Wednesday, December 03, 2003 7:46 PM
> To: [ExchangeList]
> Subject: [exchangelist] RE: how to block SMTP Commands without ISA
> Server
>
> http://www.MSExchange.org/
>
> > I don't know how to do this with Exchange, but in some firewalls (I
> > know Raptor has it), you can block TELNET to port 25. What the
> > firewall does, is time how long it takes for the commands to be
> > entered. A mail server connecting to yours on port 25, would fire
> > those commands quite rapidly, when a human would do this,
> it would be
> > much slower. Based on this, the firewall blocks entering
> commands by hand.
>
> That would then also block some one from using Telnet to diagnose a
> SMTP connection problem.
>
> John Tolmachoff
> Engineer/Consultant/Owner
> eServices For You
>
>
>
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Resource Site: http://www.windowsecurity.com/ Network Security Library:
http://www.secinf.net/ Windows 2000/NT Fax Solutions:
http://www.ntfaxfaq.com
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