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Tons of the queues with NDR in Exchange

Q: We are running Exchange 2003 with SP2. In our OWA Front End server, there are over 3,000 emails. They are sent from postmaster@chicagotech.net. We don’t have this mailbox. So I deleted them manually. Why do we have these mails in the queue and how can we delete them automatically?

A: This issue occurs if the server is the target of a reverse non-delivery report (NDR) attack. This link may help, In Exchange Server 2003 or in Exchange 2000 Server, the Exchange ...

Note: you may experience one or more of the following symptoms too:

•	The Microsoft Exchange Server queues contain many outgoing messages that are waiting to be delivered to external addresses. In this scenario, each of these e-mail messages has `postmaster@chicagotech.net` in the From field.
•	Your ISP notifies you that the email system is delivering spams.
•	Your Internet access is very slow.
•	The Store.exe process and the Inetinfo.exe process use lots of CPU time and lots of available memory.
•	If you stop the Simple Mail Transfer Protocol (SMTP) service, Internet access times are faster. Additionally, the Store.exe process and the Inetinfo.exe process return to their typical levels of CPU usage and memory usage.
•	The drive that contains the BadMail folder runs out of space. By default, the BadMail folder is located in the following folder. For Exchange Server 2003 C:\InetPub\Mailroot\ For Exchange 2000 Server C:\Program Files\Exchsrvr\Mailroot\vsi 1

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