I setup EXIM to rotate IPs and it seems to work, as when I login to my Gmail/Hotmail accounts and check the email headers...the sender IP IS rotated, as it says: "Received: from _.accessdomain.com (_._.98.91)" ^_._.98.91 is one of the IPs I'm rotating. But it also says (as part of the same headers, a few lines below what I quoted above): "Received: from _.net ([_._.97.202]:37368)" So which is the actual sending IP? Is it the first one "_._.98.91" or is it the second one "_._.97.202"? The reason I ask this is because I sort of burned through the second IP and Gmail isn't accepting messages from it. So I don't want the sender IP to be _._.97.202, because it has a poor rep with Gmail.