A user sent an email to around 100 users that contained 'distribution list A', but we found 'distribution list A' contained the same 'distribution list A' inside. So if you were to expand the distribution list you would keep on finding 'distribution lisa A'. Now that the user has sent the message the recipients are receiving throusands of duplicate emails from the sender. The nested duplicate distribution list has been removed, so the GAL can be updated, to prevent this happening again. We can see the message being sent through the Message Tracker, but do not know how to delete further duplicate messages from being sent out. How can this be stopped using a powershell command? As a temporary measure, we have created a rule on the transport server to capture and drop these messages before they fill up our users email messages. We are running Exchange 2007 SP1 Pacer

I would first start here in the Queue Viewer, http://www.msexchange.org/articles_tutorials/exchange-server-2007/management-administration/exchange-2007-message-queues.htmlMVP Exchange Server

Hi and thanks for your reply. I checked the article as a starting point, but I am still do not know how to remove these messages. I need to run a cmdlt that can identify these messages and delete them permanently, as they appear to be self generating (over 24 hours now). The queue looks empty, but if you keep on refreshing it you can capture the message before it goes off for delivery (which gets dropped by the transport rule). Any further ideas would be greatly appreciated. Thanks

I don??t think there is anything you can do natively in Exchange 2007 or Exchange 2010. Personally, removing that nested DL is the way to do and updating the GAL. However the messages which have been sent, would be in a loop. I would rename the DL email alias for now, and disable NDR's for a day. This would allow all the local and remote outlook users to receive the latest OAB which would have the updated GAL. Once, all looks good - you can rename the DL email address/alias back. -- Regards, Vik Singh -------------------------------------------------------------------------------- Please remember to click ??Mark as Answer? on the post that helps you, and to click ??Unmark as Answer? if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. "Pacerhill" wrote in message news:86fe64ae-3742-4f46-8041-44166d05a333@communitybridge.codeplex.com... Hi and thanks for your reply. I checked the article as a starting point, but I am still do not know how to remove these messages. I need to run a cmdlt that can identify these messages and delete them permanently, as they appear to be self generating (over 24 hours now). The queue looks empty, but if you keep on refreshing it you can capture the message before it goes off for delivery (which gets dropped by the transport rule). Any further ideas would be greatly appreciated. Thanks

I suggest you first stop the Microsoft Exchange Transport service and then rename mail.que to OLD_mail. Then restart the Exchange Transport service to recreate a new one. For more information about Managing the Queue Database, please refer to the following article: http://technet.microsoft.com/en-us/library/aa996006(EXCHG.140).aspx Thanks.Novak Wu-MSFT

Thank you all for your suggestions, we found the cause of the problem. One of our administrators forwarded a leaver's mail to a distribution group that contained the same leaver, creating a continous loop (Just before going on vacation!!!). Thank you all for your help.