In certain scenarios it is recommended to enable Header Firewall to prevent a message being created that could possibly spoof X-Headers in to order to imitate an edge transport server and to accept the messages by the receiving server. This is especially the case if you do not use a smart host that removes headers … More Enable Header Firewall in Exchange 2010

The following details the the system resources monitored as part of the back pressure feature and the levels of resource utilization. Free hard disk space for the message queue database High = 100 * (hard disk size – 500MB) / hard disk size Medium = 2 percent less than high level Normal = 4 percent … More Back Pressure Monitors and resource utilization values in Exchange 2010 SP1

Following the release of Exchange 2010 Service Pack 1, the functionality to configure distribution group settings based on the Exchange organization has been introduced. By getting (Get-OrganizationConfig | fl Distribution*)  the configuration data for an Exchange organization; we may see that there are three configurable parameters for distribution groups:         DistributionGroupDefaultOU – … More Configure Default Exchange Distribution Group Settings