iPhone Email Settings

cPanel Knowledge Base: How to Set Up a cPanel Email Account for iOS and Android

https://documentation.cpanel.net/display/CKB/How+to+set+up+a+cPanel+email+account+for+iOS+and+Android

Email account setup on iPhone

https://www.namecheap.com/support/knowledgebase/article.aspx/1334/2186/email-account-setup-on-iphone