To carry out this process, you must log in to cPanel and click as indicated by the arrows below:
Look for the account to which you want to assign more space and click on "Manage"
Enter the amount of space you want to assign to the account; if you choose "unlimited," the account will be able to use all the space allowed by your hosting plan.
Finally, click the "Update email settings" button to save the changes:
In this way, we will have increased the storage space of our email.