Poison Message: The poison message queue is a special queue that is used to isolate messages that are detected to be potentially harmful to the Exchange 2007 system after a server failure.
Remote Delivery: Remote delivery queues hold messages that are being delivered to a remote server by using SMTP.
Mailbox Delivery: The mailbox delivery queues hold messages that are being delivered to a mailbox server by using encrypted Exchange RPC.
Unreachable Destination: Each transport server can have only one Unreachable queue. The Unreachable queue contains messages that cannot be routed to their destinations.
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Troubleshooting Mail Flow Issues due to Mailbox Logon Failure:
Event ID 1009:The Microsoft Exchange Mail Submission service is currently unable to contact any Hub Transport servers in the local Active Directory site. The servers may be too busy to accept new connections at this time.
Reason: This issue occurs when the Microsoft Exchange Transport service is configured to log on using another account, instead of the Network Service account. For example, the Microsoft Exchange Transport service is configured to log on using the Administrator account.
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Incoming Messages to Edge Server Fail with 550 5.7.1 NDR
This issue commonly occurs when the Edge Transport server role is deployed in a perimeter network configuration and the Internet Protocol (IP) address of the internal firewall is blocked by the Edge Transport server. This issue can also occur in a non-perimeter network scenario if one or more Hub Transport server IP addresses are blocked by the Edge Transport server.
Get-IPBlockListEntry
Start-EdgeSynchronization
Remove-IPBlockListEntry
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You Cannot Send or Receive E-Mail Messages Behind a Cisco PIX Firewall:
The Exchange server is located behind a Cisco PIX firewall device that has the Mailguard feature enabled.
The Auth and Auth login Extended Simple Mail Transfer Protocol (ESMTP) commands are removed by the firewall.
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NDR when sending email to Public Folders:
The access rights for the Anonymous account for that public folder have been set to None. To ensure that users can send e-mail to a mail-enabled public folder, the public folder must have at least the CreateItems access right granted to the Anonymous account.
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Enable Pipeline Tracing in E2k7 for troubleshooting Transport Agent Problems
C:\Program Files\Microsoft\Exchange Server\TransportRoles\Logs\PipelineTracing is created.
Set-TransportServer
Pipeline tracing is a diagnostic feature in Microsoft Exchange Server 2007 that enables you to capture diagnostic information about e-mail messages as they encounter transport agents registered on Simple Mail Transfer Protocol (SMTP) events in the transport pipeline. Exchange captures verbose information about the changes that each transport agent applies to messages in the transport pipeline in message snapshot files. If transport rules are configured, Exchange Server also records any actions that each transport rule takes on these messages.
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