Where to start: Understanding Email Retrieval: POP vs. IMAP
All right, time for round two. MX Records. While POP and IMAP handle the retrieval of email, MX Records answer the question: which server is responsible for handling and accepting email for exampledomain.com?
Reclaim users: when you create a new email in your cPanel, these MX Records are created automatically. Which makes sense, right? If you create an email through cPanel, then cPanel is going to assign their servers to handle the functions of your email.
The only time that you’ll really need to mess with MX Records is if you want a third party service to handle your email. Since email can cut into your hosting storage quota, sometimes it can be useful to move your email to a service like Google Apps to free up your storage space for your website.