Microsoft Exchange 2003 – NDR Chris Lehr

Introduction to Exchange 2003 Server – NDR (Non-Delivery Report)

Cleaning up NDR stuffed mail queues by Chris Lehr

I came upon this, and was shocked it was not publicized more. Microsoft released a small utility a while ago called aqadmcli.exe. It’s a command line interface for SMTP queue management. When a domain gets spammed a lot, many NDR’s or non-delivery reports can occur, filling the queue with messages that may never get delivered. This utility allows you to set flags, and delete messages based on these flags. For example, you can use it to delete all mail with the “FROM” being “[email protected]” to remove (very very quickly compared to the GUI ESM tool) all emails sent from [email protected] (which are most likely all the NDR’s that are clogging their SMTP queue.

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