Most email applications only need the following information:
POP3/Incoming Mail Server: mail.yourdomain.com (replace 'yourdomain.com' with your domain).
SMTP/Outgoing Mail Server: Use the setting for the outgoing mail server provided by your ISP or mail.yourdomain.com (replace 'yourdomain.com' with your domain).
Account Name: Whole email address (not what just appears before the '@' symbol )
Password: The password that you entered while adding the POP3 account from the control panel interface
POP3/Incoming port: 110
SMTP/Outgoing port: 25 or 26
Enable "My server requires authentication" option.
If you want to use IMAP, then you need to update the following in your mail client settings:
1. Select IMAP as your incoming mail server.
2. Enter port no ‘143' as the Incoming mail (IMAP) port and the rest of the configuration will stay the same.
*If you don't want to delete the emails from the server, then you need to check with your Mac mail.app for this option: "Leave a copy of message on server". If you leave this option unchecked, then all the emails will be downloaded from your mail.app.