RE: Open Relay on exchange 2000

  • From: "Allen, Chris" <CAllen@xxxxxxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Thu, 18 Sep 2003 11:44:40 -0400

It is a *. 

-----Original Message-----
From: Mark Fugatt [mailto:mark@xxxxxxxxx] 
Sent: Thursday, September 18, 2003 11:28 AM
To: [ExchangeList]
Subject: [exchangelist] RE: Open Relay on exchange 2000

http://www.MSExchange.org/

I would find it highly unlikely that your firewall is causing the
problem, I
have never seen a firewall cause Exchange to relay.

On the SMTP Connector, is the address space * and do you have the "Allow
messages to be relayed to these domains" checked? 


Mark Fugatt 
MCT, MCSE, Microsoft Exchange MVP 
Pentech Office Solutions Inc 
Tel:  585 586 3890
Cell: 585 576 4750
Fax:  585 249 0316 
www.4mcts.com 
www.exchangetrainer.com 



-----Original Message-----
From: Allen, Chris [mailto:CAllen@xxxxxxxxxxxxxxxx] 
Sent: Thursday, September 18, 2003 11:22 AM
To: [ExchangeList]

http://www.MSExchange.org/

We do, but I have verified their settings as well. It looks like
possibly it
is relaying because the firewall is passing its internal address as the
sender. One suggestion was to change "only the list below" with the
internal
IP range to "All except the list below" and add the internal IP of the
firewall. I will give that a shot and let you know. If this is the
solution,
feel free to add it to your article.

My IT team got this information from the following:
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=u9Q3
TwpeDHA.1760%40TK2MSFTNGP09.phx.gbl&rnum=1&prev=/groups%3Fhl%3Den%26lr%3
D%26ie%3DUTF-8%26oe%3DUTF-8%26q%3Dprevent%2Bopen%2Brelay%2Bexchange%2B20
00%2Bbehind%2Bfirewall



-----Original Message-----
From: Mark Fugatt [mailto:mark@xxxxxxxxx]
Sent: Thursday, September 18, 2003 9:57 AM
To: [ExchangeList]
Subject: [exchangelist] RE: Open Relay on exchange 2000

http://www.MSExchange.org/

Yes, you are indeed an open relay, unplug your Exchange server NOW, read
my
article again and double-check all your settings, do you have any SMTP
Connectors? 


Mark Fugatt
MCT, MCSE, Microsoft Exchange MVP
Pentech Office Solutions Inc
Tel:  585 586 3890
Cell: 585 576 4750
Fax:  585 249 0316
www.4mcts.com
www.exchangetrainer.com 



-----Original Message-----
From: Chris Allen [mailto:callen@xxxxxxxxxxxxxxxx]
Sent: Thursday, September 18, 2003 9:40 AM
To: [ExchangeList]

http://www.MSExchange.org/

I have read the article on
http://www.msexchange.org/pages/article.asp?id=54 and Microsoft's
knowledge
base articles (310380, 314734, and 304897) and verified through each of
these that my exchange server is not set up as an open relay.
However, ORDB.org ran a test on it and list it as such. When I found out
about this, I attempted to send an open relay message from outside my
network and was also able to do it. Any advise on how to stop open relay
beyond what was published in these articles? We put in a new firewall
two
days ago (also the same day the site was submitted to ORDB) but I am not
sure how a firewall would open relaying when exchange has it turned off.
Any advise would be appreciated. Thanks in advance.

Chris Allen
Systems Administrator

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