Managing the Store & DAG: EXCERPT from Microsoft® Exchange Server 2013 Inside Out

Corrupt item detection and isolation

Bad items or messages that contain some corruption such as a malformed header have a nasty habit of causing extreme difficulty for an Exchange administrator. Exchange 2007 introduced the ability to detect and isolate corrupt messages in the transport system. Essentially, if the transport system thinks that a message is corrupt and likely to cause problems such as provoking a software crash, it considers the message poison and isolates it in a queue the administrator can examine to decide whether the message really is a problem. Exchange can identify and then isolate or quarantine problematic mailboxes to address when a mailbox that contains one or more corrupt items can cause the Information Store process to ...