This page has a variety of information on cPanel servers.
Common Ports - Common ports that are used on cPanel Servers
cPanel Scripts - Listing and brief explanations for common cPanel Scripts
Software Versions - What versions of Linux, Apache, php, mySQL, etc are installed?
Config Files - Where are cPanel config files?
DNS - DNS in WHM and cPanel
Log Locations - Where are log files?
View sent notifications:
exim exim is the SMTP mailserver
Solr - cPanel uses Solr to index and search mail messages.