Stop Cpanel
% /etc/init.d/cpanel stop
Create the following files to disable CPanel’s Exim, POP, and IMAP services:
/etc/eximdisable
/etc/imapdisable
/etc/cpimapdisable
/etc/cppopdisable
/etc/popdisable
Afterwards, restart your Cpanel services:
% /etc/init.d/cpanel restart
Alternatively, you can turn them off in the CPanel interface in the Service Configuration panel.