Linux Admin Instructions for Improving Mail Server Performance

I need instructions (via a text file or Microsoft Word / OpenOffice document) on how to increase the mail sending performance of a dedicated Cpanel Server. Assume extra IP's are available, and the server is stock CPanel (which runs Exim). The configuration must not interfere with standard cpanal operations. Assume the audience has moderate technical capability (can install RPM's and edit config files, as well as start / stop services as root). They may / may not be able to build software from source. Specifically, I need to know, step by step, how to: a) Install / configure a cacheing DNS server according to industry-standard "best practices) b) Deferred DNS lookup c) Set Exim to "accept then deliver" mode, so that software can send mail quickly, queued for later delivery. d) Multiple email queues e) Any other performance improvements you can think of (bonus available for coming with unique and relevent ideas that work). ## Deliverables Word / OpenOffice / Text document describing in detailed the step by step method for accomplishing all tasks. The work will be "work for hire", however your byline will remain on the work, as well a URL to your site and email address, if requested. Each section should look like. Topic: Install Cacheing DNS Server Description: We install a cacheing DNS server to enahance lookup performance when sending mail (etc) Software required: download package XXXX from LOCATION, full documentation is here: LOCATION Steps: 1) .. 2) .. 3) .. Testing (how to test to make sure it's installed properly) ## Platform Stock CPanel Linux Server, as provided by EV1 Servers (RHEL 3.0, I believe)