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09.13.2007 at 08:52AM PDT, ID: 22826567
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System Administrator - Undeliverable: messages
Tags: system, administrator, undeliverable, message
within the past month, we have been getting slammed by messages from the System Administrator account regarding undeliverable messages.  I know now this results from evil spammers forging our domain name in the reply to section of the spams they send out to third parties.  These messages are then bounced back to us when they send them to invalid email address.  We get thousands of these per day.

My question is:  Is there any way within Exchange to turn off these System Administrator NDR messages?  In desperation, I don't care if we don't receive legitimate NDR's from emails we actually sent out to real clients that bounce back.  
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Question Stats
Zone: Networking
Question Asked By: mtkaiser
Solution Provided By: Sembee
Participating Experts: 2
Solution Grade: B
Views: 436
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09.13.2007 at 08:55AM PDT, ID: 19884763

Rank: Genius

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09.13.2007 at 09:18AM PDT, ID: 19884963

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09.13.2007 at 10:31AM PDT, ID: 19885561

Rank: Savant

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09.13.2007 at 08:55AM PDT, ID: 19884763

Rank: Genius

check http://support.microsoft.com/kb/294757 to disable NDRs

also check the "Securing Exchange" section at http://www.amset.info/exchange/
 
09.13.2007 at 09:18AM PDT, ID: 19884963
I have already unchecked the box next to "Allow non-delivery reports", and restarted the server.  It made no difference,  these messages just keep coming in.  I have also enabled the recipient filtering just as that document recommends.  The emails from the spammers are not being sent to invalid addresses at my domain, but to invalid address outside of my domain using my domain name as the reply to address.  So we get the non-delivery messages from these other domains.
 
09.13.2007 at 10:31AM PDT, ID: 19885561

Rank: Savant

Your domain is being spoofed.
There is not a lot you can do about those. You have to accept the NDR message otherwise you will get blacklisted. Whatever you have done about disabling non-delivery reports I would suggest that you undo because that will not help this issue.
You will simply have to ride out the storm.
The real problem is clueless network admins who accept all email for their domain and then try to send back NDRs for messages sent to non-existent users. If they didn't do that then this wouldn't be an issue.

Simon.
Accepted Solution
 
 
20080206-EE-VQP-25 / EE_QW_2_20070628