On Wed, Aug 31, 2011 at 04:02:40PM +0100, John Honan wrote: > Could it be the Exchange 2010 Address Rewriter agent messing with the > header? > > [1]http://technet.microsoft.com/en-us/library/aa996806.aspx#SMTP > > You can check out the rewriter rules for your server; > [2]http://technet.microsoft.com/en-us/library/aa997185.aspx > > But if this is the default behaviour of Exchange, then a more robust > solution would be... a workaround! Unfortunately, I don't have administrative acces to the Exchange server, so I'm at the mercy of the admins. I guess I can request that they configure Exchange to not change that specific header, but I'm sure that would come off as an odd request. -- . o . o . o . . o o . . . o . . . o . o o o . o . o o . . o o o o . o . . o o o o . o o o