RE: how to block SMTP Commands without ISA Server
- From: "Gabrie van Zanten" <gabrie@xxxxxxxxxxxxxxxx>
- To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
- Date: Wed, 3 Dec 2003 20:09:26 +0100
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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