Exchange Q&A: Mail Flow (7)

1.What are the message properties?

Message status:

  • Active;
  • Locked;
  • PendingRemove;
  • PendingSuspend;
  • Ready;
  • Retry;
  • Suspended.

2.What information a NDR includes?

NDRs include a code that indicates why the message wasn’t delivered, and possible solutions to help get the message delivered.

3.What are the syntax an enhanced status code use?

class:

4: indicates a temporary delivery error;

5: indicates a permanent delivery error.

subject:

1: Addressing;

2: Mailbox (the recipient);

3: Mail system (the destination mail system);

4: Network and routing;

5: Mail delivery protocol;

7: Security or policy.

detail:

A 1 to 3 digit number that further classifies the error.

4.What is back pressure?

Back pressure is a system resource monitoring feature of the Microsoft Exchange Transport service that exists on Mailbox servers and Edge Transport servers. Back pressure detects when vital system resources, such as hard drive space and memory, are overused, and takes action to prevent the server from becoming completely overwhelmed and unavailable.

5.What system resources are monitored by back pressure?

DatabaseUsedSpace[%ExchangeInstallPath%TransportRoles\data\Queue]:

Hard drive utilization for the drive that holds the message queue database.

PrivateBytes:

The memory that’s used by the EdgeTransport.exe process.

QueueLength[SubmissionQueue]:

The number of messages in the Submission queue.

SystemMemory:

The memory that’s used by all other processes.

UsedDiskSpace[%ExchangeInstallPath%TransportRoles\data\Queue]:

Hard drive utilization for the drive that holds the message queue database transaction logs.

UsedDiskSpace[%ExchangeInstallPath%TransportRoles\data]:

Hard drive utilization for the drive that’s used for content conversion.

UsedVersionBuckets[%ExchangeInstallPath%TransportRoles\data\Queue\mail.que]:

The number of uncommitted message queue database transactions that exist in memory.

6.What levels of resource utilization or pressure are defined?

  • Low or Normal;
  • Medium;
  • High.

7.How to view the back pressure settings on an Exchange server?

[xml]$bp=Get-ExchangeDiagnosticInfo [-Server <ServerIdentity> ] -Process EdgeTransport -Component ResourceThrottling; $bp.Diagnostics.Components.ResourceThrottling.ResourceTracker.ResourceMeter

8.What are the types of message size limits?

  • Whole message size limits;
  • Attachment size limits;
  • Recipient limits;
  • Message header size limits.

9.How to set the maximum size of a message received using Exchange Management Shell?

Cmdlet: Set-TransportConfig

Parameter: MaxReceiveSize

10.How to set the maximum size of a message sent using Exchange Management Shell?

Cmdlet: Set-TransportConfig

Parameter: MaxSendSize

Still have questions? Click here to view Microsoft’s official documentation on Exchange.

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