Solved

How do I prevent open relay but allow anonymous connections?

Posted on 2010-11-11
7
631 Views
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.
0
Comment
Question by:leviatdr
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
7 Comments
 
LVL 35

Assisted Solution

by:Ernie Beek
Ernie Beek earned 200 total points
ID: 34116415
read this one: http://www.amset.info/exchange/smtp-openrelay.asp

You can skip the part to check if you're an open relay ;-)
0
 
LVL 9

Expert Comment

by:vanbarsoun
ID: 34116429
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.
0
 

Author Comment

by:leviatdr
ID: 34116450
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?
0
Free eBook: Backup on AWS

Everything you need to know about backup and disaster recovery with AWS, for FREE!

 
LVL 9

Accepted Solution

by:
vanbarsoun earned 300 total points
ID: 34116482
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


0
 
LVL 35

Expert Comment

by:Ernie Beek
ID: 34116550
' I went through the article above and could not resolve my issue'

How did you check?
0
 

Author Comment

by:leviatdr
ID: 34116643
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?
0
 

Author Closing Comment

by:leviatdr
ID: 34116656
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.
0

Featured Post

Office 365 Training for IT Pros

Learn how to provision tenants, synchronize on-premise Active Directory, implement Single Sign-On, customize Office deployment, and protect your organization with eDiscovery and DLP policies.  Only from Platform Scholar.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

MS Outlook is a world-class email client application that is mainly used for e-communication globally.  In this article, we will discuss the basic idea about MS Outlook, its advanced features, and types of MS Outlook File formats.
This article provides a convenient collection of links to Microsoft provided Security Patches for operating systems that have reached their End of Life support cycle. Included operating systems covered by this article are Windows XP,  Windows Server…
In this video we show how to create a Shared Mailbox in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Recipients >> Sha…
To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates…

696 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question