Created on 2004-Oct-23
Updated on 2005-Jul-18
RESOLUTION: When mail should be delivered off-server for a domain, the domain should be:
1. Removed from /etc/localdomains
2. Added to /etc/remotedomains
optional: then run /scripts/mailperm
source: http://forums.cpanel.net/showthread.php?t=29593&highlight=external+mail+server