So, I have a distribution group set up called Accounts and have 2 users receiving these e-mails, but the users are unable to send on behalf of "Accounts" upon searching there doesn't appear to be anywhere in the GUI to configure this detail. I found that by running the exchange cmdlet command "Set-DistributionGroup -Identity GroupName -GrantSendOnBehalfTo User1,User2" it accepts and doesn't give an error message, however when getting the users to test they still receive the error stating they do not have permission to send on behalf of that user. I can see the send as permissions for user accounts but not for distribution groups.
The site is running SBS 2008 with exchange 2007. Can any one help me, its really starting to bug me.