By default, all of your emails will be routed through a premium mail delivery service called 'MailChannels'.
This is how we ensure all mail is correctly delivered to your customers / visitors. Email authentication for other hosting providers is used to prevent SPAM, however, you will find in the majority of cases your accounts are 'pre-configured' to enhance your mail delivery rate, which is included free of charge with your reseller hosting or cpanel hosting accounts.
You can read more about MailChannels by clicking here. Because we relay through MailChannels for improved delivery, this section within cPanel is mostly irrelevant.