1.) Go to Settings
2.) Search for "Email" Application
3.) Click Manage Accounts
4.) Then Click "+"
5.) Input the Credentials which must be provided (Email address and Password)
6.) After Completing the credential, click "Manual Setup"
7.) Then afterwards click IMAP when choosing what type of account
8.) In the incoming server settings, Fill out the credentials needed. Fill the IMAP SERVER into "mail.domain.com" and set the incoming port number into "143" (replace domain.com into your own domain name)
9.) In the outgoing server settings, fill the SMTP SERVER into "mail.domain.com" then click Continue and click next and set the necessary credentials needed.
10.) Then lastly click done.