We are sending marketing mail (double opt-in) for clients from our server via a mailscripts. We got RDNS and SPF records set up and installed DomainKeys. Currently we are reaching Yahoo inboxes but not hotmail or gmail and we like to improve this. Not too sure if the DomainKeys are set up properly. The problem is that we are running cpanel which only supports Exim 4.69 (before proper DKIM support). We would require some help to get the server (well, exim) properly setup for better mail delivery rates. Server running on CentOS 5.5. We would require a short outline of what you would suggest of installing/changing. This could lead to ongoing server maintenance work if the job is done satisfacory. Good communication is important.