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How do I prevent open relay but allow anonymous connections?

Posted on 2010-11-11
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Last Modified: 2012-05-10
I have a Microsoft Exchange 2003 server on MS Windows Server 2003. My server was sending out spam. I removed the anonymous access from the Access Control and now it isn't an open relay, but it appears as though external email is not being delivered. Did I do something wrong? Thanks.
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Question by:leviatdr
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by:Ernie Beek
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read this one: http://www.amset.info/exchange/smtp-openrelay.asp

You can skip the part to check if you're an open relay ;-)
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by:vanbarsoun
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You need enable the anonymous access. Click the RELAY button in the Access tab and make sure ONLY THE LIST BELOW is selected and no entries exist below that.
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by:leviatdr
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When I have Anonymous Access enabled, I can telnet into my mail server and send email without authentication. I went through the article above and could not resolve my issue. What else can I check?
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vanbarsoun earned 300 total points
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You will be able to send email to addresses in your domain without authentication, but not to other domains. Go here and check to see if your IP is relaying:
http://mxtoolbox.com/diagnostic.aspx


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by:Ernie Beek
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' I went through the article above and could not resolve my issue'

How did you check?
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by:leviatdr
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I checked it by trying the commands through telnet from an external IP.

I was incorrect about being an open relay. It seems more like a compromised user account. I've enabled authentication logging, hopefully I can figure out where the bulk email came from. Anything else I should watch?
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Author Closing Comment

by:leviatdr
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My initial assumption was wrong. I was not a open relay. Further investigation is needed to find out why my mail server was sending out spam.
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