I followed this tutorial: http://docs.cpanel.net/twiki/bin/view/AllDocumentation/WHMDocs/EximDifferentIps
To specify "which IP addresses specific domains on your server should send mail with Exim".
I restarted exim. I restarted the server. No matter what I do, all of the emails that are supposed to be coming from MYDOMAIN.COM (ip 126.96.36.199) are coming from MY.SERVER.HOSTNAME.COM (ip 188.8.131.52).
I have setup rDNS and PTR records so I would very much like my emails to be coming from the ip address and domain name they are supposed to be coming from.