If an exim upgrade fails use the following to force a fresh upgrade of exim and then check the exim system status
/scripts/eximup –force
service exim status
How to Enable RBL’s in Exim via CPanel/WHM:
The WHM now allows you to enable Spamhaus (zen.spamhaus.org) and SpamCop via the WHM
Login to the WHM
Click Exim Configuration Editor
Check both RBL’s
Save your settings