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When a computer that is running Microsoft Exchange Server 2007 with Service Pack 1 (SP1) receives a message that includes an invalid P2 header, the EdgeTransport.exe process may stop responding if the priority queuing feature is enabled. Additionally, event messages that resemble the following are logged in the Application log on the Exchange server:
Event Type: ErrorEvent Source: MSExchange CommonEvent Category: General Event ID: 4999Description:Watson report about to be sent to dw20.exe for process id: <ID>, with parameters: E12, c-RTL-AMD64, <version>, edgetransport, M.E.Transport, M.E.T.TransportMailItem.CheckDeliveryPriority, System.InvalidOperationException, 61ca, <version>. ErrorReportingEnabled: False
Event Type: ErrorEvent Source: MSExchangeTransportEvent Category: SmtpReceive Event ID: 1033Description:An exception was thrown while processing data from client IP address <IP address>. The exception is System.InvalidOperationException: We should always have a P2 From or Sender before going to delivery at Microsoft.Exchange.Transport.TransportMailItem.CheckDeliveryPriority() at Microsoft.Exchange.Transport.TransportMailItem.ValidateDeliveryPriority(SmtpResponse& failureResponse) at Microsoft.Exchange.Protocols.Smtp.BaseDataSmtpCommand.PriorityMessageChecksPass() at Microsoft.Exchange.Protocols.Smtp.BaseDataSmtpCommand.OnEod(Boolean isAsync) at Microsoft.Exchange.Protocols.Smtp.BaseDataSmtpCommand.RawDataReceived(Byte data, Int32 offset, Int32 numBytes) at Microsoft.Exchange.Protocols.Smtp.SmtpInSession.ReadComplete(IAsyncResult asyncResult).
Note Each Internet e-mail message contains the following two portions:
The RFC 2821 portion that is also known as the P1 header
The RFC 2822 portion that is also known as the P2 header
The P1 header is the sender's address in the MAIL FROM field during the SMTP connection that is defined in RFC 2821. The P2 header is the sender's address in the message body that is defined in RFC 2822. The P2 header includes the FROM, REPLY TO, and SENDER fields.
To resolve this problem, install Update Rollup 7 for Exchange Server 2007 Service Pack 1.
For more information about Update Rollup 7 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: