User sending on behalf of a shared mailbox

We give users "send on behalf" of permissions to shared mailboxes. In Exchange 03, when the message arrived, it showed who sent the message on belhaf of the shared mailbox. Exchange 07 does not seem to do this.
When sending from a shared mailbox, the mail comes from the shared mailbox and not from the user with send on behalf of. We need this funtion back if possible.
Can anyone help??
megolodonAsked:
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mass2612Connect With a Mentor Commented:
Hi,

How did you assign the permissions? There is a difference between Send As and Send on behalf. Send on behalf permissions set the mailbox to act in the way you describe i.e. "Mailbox on behalf of Mailbox"

You probably need to remove the Send as rights on the mailbox and then add send on behalf of.

To remove send as: -
Remove-ADPermission -Identity SharedMBX -user Testaccount -ExtendedRights "send as"

Add Send on behalf: -
Set-Mailbox SharedMBX -GrantSendOnBehalfTo testaccount

Understanding Mailbox Permissions
http://technet.microsoft.com/en-us/library/bb123879.aspx
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