Add send on Behalf on Distribution grous

Many users want to send E-Mail from a distribution group. By default in Exchange 2010 is this disabled, but we can enable this function form Exchange Management Shell with only one command:
Set-DistributionGroup GroupName -GrantSendOnBehalfTo UserName
This will enable user with UserName to choice to send mail from his personal account or from GroupName account. Of course you must run PowerShell as administrator..