Entourage 2008 Send As a Distribution Group

Hi,

This is for an exchange account.

I am having a little trouble sending as a distribution group in entourage. My company has a distribution group we want to send messages to clients from (to save licenses, we don't want to make it a user). In Outlook '07 on Vista, we can "Send As" fine, and the email comes through with the "From" as "Distribution Group Name". HOWEVER, when I send the email from Entourage, it shows "From" as "Distribution Group Name (sent by ...)". In other words, it seems Entourage is adding a sent by or sent from tag.

I have added "Distribution Group Name" as a "User I am a delegate for" under account settings.

Basically, my question is: is there a way to get rid of the "(sent by ...)" tag in Entourage 2008?

I can upload screen shots of the two different emails if need be.