Symptoms

Intermittently messages are not delivered and no non-delivery report (NDR) is generated in Microsoft Exchange Server 2019 or Exchange Server 2016. You eventually find that the missing messages are landed in the Poison message queue.


In addition, the following events are logged in the application log:


Time:     DateTime

ID:       1051

Level:    Warning

Source: MSExchange Extensibility

Machine:

Message:  Agent 'Mailbox Rules Agent' caused an unhandled exception 'NotInBagPropertyErrorException: [0x66a5000b] SendReadNotifications' while handling event 'OnPromotedMessage'


Time:     DateTime

ID:       25012

Level:    Error

Source: MSExchangeTransportDelivery

Machine:

Message:  An unhandled exception was thrown while processing data from client IP address <IPAddress>. SMTP state transitions: WaitingForGreeting -> GreetingReceived (EhloProcessed)

GreetingReceived -> WaitingForGreeting (XAnonymousTlsProcessed)

WaitingForGreeting -> GreetingReceived (EhloProcessed)

GreetingReceived -> GreetingReceived (XExpsProcessed)

GreetingReceived -> GreetingReceived (XSessionParamsProcessed)

GreetingReceived -> MailTransactionStarted (MailProcessed)

MailTransactionStarted -> WaitingForMoreRecipientsOrData (RcptProcessed)

WaitingForMoreRecipientsOrData -> ReceivingBdatChunks (BdatProcessed)

ReceivingBdatChunks -> ReceivingBdatChunks (BdatProcessed). Exception System.ExInvalidOperationException: Agent 'Mailbox Rules Agent' encountered an unexpected error while handling event 'OnPromotedMessage'. ---> Microsoft.Exchange.Data.Storage.NotInBagPropertyErrorException: [0x66a5000b] SendReadNotifications



Time:     DateTime

ID:       10003

Level:    Error

Source: MSExchangeTransportDelivery

Machine:

Message:  The transport process failed during message processing with the following call stack: System.ExInvalidOperationException: Agent 'Mailbox Rules Agent' encountered an unexpected error while handling event 'OnPromotedMessage'. ---> Microsoft.Exchange.Data.Storage.NotInBagPropertyErrorException: [0x66a5000b] SendReadNotifications


Resolution

To fix this issue, install one of the following updates:

For Exchange Server 2019, install the Cumulative Update 7 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.​
For Exchange Server 2016, install the Cumulative Update 18 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.

References

Learn about the  terminology that Microsoft uses to describe software updates.

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