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Default Virtural SMTP Server

Posted on 2008-06-17
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Last Modified: 2013-11-30
I am noticing a number of sessions with IP addresses that appear on a number of black lists.  I have terminated these sessions and am watching it more closely but I am trying to figure out if this is a problem and how to stop them if it is.  As I run SMTP Diagnostics from http://www.mxtoolbox.com I ger an error that says:  WARNING! Your server could be an open relay.

How can I see if it is, how do I turn it off if it's bad
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Question by:4Beardog
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by:ryansoto
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Do you have relay enabled
right click on the virtual server then properties>access tab then relay button.
Is relay enabled?
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by:purplepomegranite
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What version of Exchange are you running?
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by:4Beardog
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Exchange Server 2003
Relay is turned on only for ip address 10.1.0.0 and 10.2.0.0 (this was set up by the previous administrator)
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cshepfam earned 250 total points
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You need to follow this step by step:


http://www.amset.info/exchange/spam-cleanup.asp
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by:purplepomegranite
purplepomegranite earned 250 total points
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10.1.0.0 and 10.2.0.0  being your local subnet?  Do you need to keep these settings?  All your client computers shouldn't need this, as they authenticate with Exchange anyway.  If you do have any servers or other software that needs to relay, allow that only by specific IP address.  The problem with allowing your entire internal subnet is that it potentially opens up holes that can be exploited.
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