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How do I prevent open relay but allow anonymous connections?

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.

SOLUTION

Ernie Beek

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vanbarsoun

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.

leviatdr

ASKER

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?

ASKER CERTIFIED SOLUTION

vanbarsoun

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Ernie Beek

' I went through the article above and could not resolve my issue'

How did you check?

leviatdr

ASKER

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?

leviatdr

ASKER

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.