In cPanel, you can change the size of an email inbox for a specific email account by following these steps:
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Log in to your cPanel account.
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In the "Email" section, click on the "Email Accounts" icon.
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Select the email account for which you want to change the inbox size.
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Under the "Mailbox Size" section, you will see the current size of the inbox.
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To change the size, click on the "Change" button.
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Enter the desired size for the inbox in the "Mailbox Quota" field. You can enter a value in megabytes (MB) or gigabytes (GB).
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Click on the "Change Quota" button.
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Confirm that the mailbox size has been changed by checking the mailbox size for that email account.
Also, keep in mind that increasing the mailbox size too much could cause your hosting account to run out of disk space, so be mindful of your resources when setting mailbox quotas as hosting account combine the total space together from your website files, databases, and email accounts.