RE: Am I Relaying?
- From: "David Elmquist" <david@xxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Fri, 1 Feb 2002 17:12:35 +0100
Take a look at
http://www.abuse.net/relay.html
You can test your mailserver from there.
David Elmquist
-----Original Message-----
From: Craft, Steve [mailto:SCraft@xxxxxxxxxxx]
Sent: 1. februar 2002 15:31
To: [ISAserver.org Discussion List]
Subject: [isalist] Am I Relaying?
http://www.ISAserver.org
I have a mail server sitting behind my ISA host. ISA is publishing port
25 only for SMTP. On my mail server's relaying rules (IMail), I only
relay for specific internal IP numbers.
I just added the IP number of the internal interface to the IMail
allowed-relay list, and added ISA alerts to send mail to the internal
server if there is a problem.
However, now I am thinking about it, did I just open up my system to
relay for the world? I am afraid that anyone can send SMTP to the
external ISA interface, it will pass the packets to the internal, and
the mail server will allow it since it thinks it is the ISA server
sending the message, and now I am part of the spam problem. I was
thinking that the mail publishing acts like web publishing where the web
server always thinks traffic comes from the ISA and not the real
external client.
Is this true?
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