cpanel send email from another server

http://www.thecpaneladmin.com/changing-exims-sending-ip/

http://docs.cpanel.net/twiki/bin/view/AllDocumentation/WHMDocs/EximDifferentIps

this guide working

To configure a smart host, create

PHP Code:

/etc/exim.conf.local  

and add the following lines. 



Be sure to change to the hostname or ip of the smart host server:

PHP Code:

 @ROUTERSTART@
            smart_route:
                driver = manualroute
                domains = !+local_domains
                transport = remote_smtp
                route_list = * host.name.of.smart.host.server  

Next run

PHP Code:

/scripts/buildeximconf  

Then run

PHP Code:

/scripts/restartsrv_exim  

http://www.underhost.eu/forums/tutorials-how-cpanel-whm/480-how-configure-exim-cpanel-server-use-smart-host.html