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This issue is caused by the fact that your mail account’s quota has been exceeded. To confirm this, log into cPanel and go to Email Accounts, where you can see the current size of your existing mail accounts or adjust their quota.
On Cloud accounts and Dedicated servers you can simply increase the mail account’s quota. However, on a Shared Hosting account the quota cannot exceed a certain value, depending on your hosting plan. When over the quota, you would have to clean up your mailbox.
