Shared Web Hosting plans
The Hatchling, Baby, and Business plans all come with unlimited amounts of disk space and bandwidth. This means you have unlimited disk space to store emails.
Reseller Hosting plans and SEO Hosting plans
The reseller and SEO plans all come with limited amounts of disk space and bandwidth. This means you must allocate disk space to each cPanel. The disk space allocated to a cPanel is also the limit for email storage. If you need more disk space to allocate, you may upgrade to a more powerful plan.
Dedicated Server plans
The Dedicated Server plans all come with limited amounts of disk space and bandwidth. This means you must allocate disk space to each Domain Control Panel. The disk space allocated to a Control Panel is also the limit for email storage. If you need more disk space to allocate, you may purchase a more powerful server, or you may purchase an additional hard drive. Your server has physical limitations, so pay attention to the total disk space on your account.
Limit Emails to a Quota
Of course, when you create any email account, you are allowed to apply an optional quota for that specific email name. This quota will prevent the email user from using all of the disk space for your control panel.