Thanks for your question about the incoming and outgoing host name [mail server settings]. It depends on the type of settings you're using in the email client - secure or non-secure, and also the type of server you're on. Click on this article link to find out how you can find them: Finding your Email settings in cPanel.
If you are not an administrator for the account, you can still find the email settings using the webmail option.
If you have any further questions or comments, please let us know.