How to Setup POP3 Account on El Capitan

Apple Mail open, click Mail from the top left of the screen and then select Add Account, select Other Mail Account… and click Continue

Fill in your name, email address and password, and click Sign In

In the new window select Account Type (POP). Either option you choose, the same settings apply going forward.
Enter for Incoming and Outgoing Mail server:

Sign In. You\’ve completed setting up e-mail.