Nathan, I tried that. The "Sender:" line still came through. Is there some other config parameter that might be overriding it? - Mark On Wed, 20 Feb 2008 15:34:24 -0500, Nathan Brindle <[log in to unmask]> wrote: >Sender= None > >At 03:23 PM 2/20/2008 -0500, you wrote: >>Hi, >> >>I am trying to set up a series of lists meant to behave like sendmail >>aliases. The idea is to have an address like [log in to unmask] and let >>the department secretary control who gets mail sent to the address >>(subscriber control). >> >>In general I've got this working. Setting "Default-Options=IETFHDR" helped a >>lot. The problem is that certain email clients (meaning Outlook) take it >>upon themselves to read the "Sender:" header line and display it in the >>"From" field as "<Sender:> on behalf of <From:>. >> >>Seems like typical Microsoft making their own rules to me, but Outlook is so >>common I have to deal with it. >> >>Thanks for any help. >> >> - Mark