When configuring a mail client, finding the right settings to enter can be complicated. Thankfully, cPanel has a dedicated interface with the configuration options available.
Procedure
First, log into Webmail. Webmail is running on port 2096 on your cPanel server.
https://server-hostname-or-ip:2096/
If Webmail loads directly into Roundcube or Horde, click the link in either the top-right or the middle-left to get back to Webmail Home.
From here, scroll to the bottom and select "Configure Mail Client"
This page has automated files for configuring iOS and macOS devices, as well as Windows Live Mail. The manual settings are available for all other clients.
We strongly recommend using the IMAP option with SSL/TLS.
We do not recommend enabling the "Secure Password Authentication" feature in your client, as this is a Microsoft-proprietary authentication scheme that is not compatible with cPanel and will cause authentication failures.