Exchange 2003 Open Relay Cannot be Shutdown

Posted on 2004-04-12
Medium Priority
Last Modified: 2010-03-05
OK, confirmed the following from http://support.microsoft.com/?id=324958:

Right-click Default SMTP Virtual Server and then click Properties.
Click the Access tab.
Click the Relay... button at the bottom.
The default settings block open relay. The default settings are as follows:
Select Only the list below.
The Computers dialog box shows Access Granted to the Internal IP address of the Small Business Server network and to the external IP address (if the server has more than one network card.)
Make sure that Allow all computers which successfully authenticate to relay, regardless of the list above is selected.
Set the Default SMTP Virtual Server configuration for relaying as indicated, which restores its settings to their defaults.

Testing by connecting on port 25 and sending mail to a outside domain from an outside domain works fine. However, my understanding of the above would lead me to believe that should not be possible. While doing this simple test, 12,000 SPAM messages are in my queue, although all messages are going to a non-existant smart host.

If i re-install SMTP, the telnet test shows that open relay is closed, adn the settings above are the same. But, of course Exchange doesn't work. As soon as i re-install Exchange 2003, the open relay is off and running again.

This is of course a major issue, and every time i find an article on how to close it, it is already closed, but as soon as SMTP is started it's wide open again. Anyone have any ideas at all?
Question by:maladyetz
  • 2
  • 2

Accepted Solution

spakko earned 2000 total points
ID: 10809364
Hmmm, I do not agree with this article. Try this:

1. Open SMTP properties.
2. Go to the Access tab.
3. UNTICK allow authenticaed users to relay! (there is an exploit that uses this to relay)
4. In the computers dialogue box make sure your subnet is listed (ie a group of computers in Exhange terminology), eg

Try that, it should work.

Author Comment

ID: 10809390
OK, trying this, unfortunately there could be over 10K in the queue, if it stops growing and i cna clean it out, that would be a sign this is working. i did try the telnet test and was rejected, so hopefully this will resolve it. Let you know tomorrow most likely.

Author Comment

ID: 10814409
This worked, and should be noted somewhere on Microsoft's site as an issue. Thank you so much. It is working like a charm, now that the 30K emails are deleted.

Expert Comment

ID: 10818499
Most welcome :)

Featured Post

Simplify Active Directory Administration

Administration of Active Directory does not have to be hard.  Too often what should be a simple task is made more difficult than it needs to be.The solution?  Hyena from SystemTools Software.  With ease-of-use as well as powerful importing and bulk updating capabilities.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

There’s hardly a doubt that Business Communication is indispensable for both enterprises and small businesses, and if there is an email system outage owing to Exchange server failure, it definitely results in loss of productivity.
Configure external lookups on for external mail flow on Exchange 2013 and Exchange 2016.
The video tutorial explains the basics of the Exchange server Database Availability groups. The components of this video include: 1. Automatic Failover 2. Failover Clustering 3. Active Manager
Whether it be Exchange Server Crash Issues, Dirty Shutdown Errors or Failed to mount error, Stellar Phoenix Mailbox Exchange Recovery has always got your back. With the help of its easy to understand user interface and 3 simple steps recovery proced…

600 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