Hint!
Please try the following:
# rpm -qa | grep exim
# rpm -e exim-4.52-15_cpanel_maildir (exim-4.52-15_cpanel_maildir is what the previous command returned to me)
error: Failed dependencies:
smtpdaemon is needed by (installed) mdadm-1.6.0-3.i386
smtpdaemon is needed by (installed) mutt-1.4.1-11.rhel4.i386
smtpdaemon is needed by (installed) fetchmail-6.2.5-6.el4.2.i386
smtpdaemon is needed by (installed) fetchmail-6.2.5-6.i386
/usr/sbin/sendmail is needed by (installed) redhat-lsb-3.0-8.EL.i386
/usr/sbin/sendmail is needed by (installed) redhat-lsb-1.3-5.2.i386
This is the output i received when i've runned the 2nd command
# rpm -e exim-4.52-15_cpanel_maildir mdadm-1.6.0-3.i386 mutt-1.4.1-11.rhel4.i386 fetchmail-6.2.5-6.el4.2.i386 fetchmail-6.2.5-6.i386... (you got the idea)
# /scripts/eximup --force
I guess this will do it. I'm not sure it's the best way to reinstall exim, but it's the only one i know. I've tested it, no accounts/settings were lost on my servers.