Each e‑mail account in cPanel has a storage quota that limits how much disk space it can use. When a mailbox exceeds its quota, new messages may bounce back to senders or fail to deliver.
Symptoms of Exceeding Quotas
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Senders receive a bounce message:
Mailbox quota exceeded -
You cannot send or receive new messages.
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Webmail shows warnings about storage limits.
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Mail client (Outlook, Thunderbird, Apple Mail) may fail to sync.
Resolving Quota Issues
1. Increase the Quota
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Log in to cPanel.
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Go to Email → Email Accounts.
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Locate the account → click Manage.
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Under Storage, increase the quota or set to Unlimited.
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Click Update Email Settings.
2. Clean Up Mailbox
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Log in to cPanel → Email Disk Usage.
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Select the account.
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Identify folders consuming the most space (Inbox, Sent, Trash, Junk).
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Use filters to delete:
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Messages older than 1 year.
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Messages larger than 30 MB.
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All messages in Trash/Junk.
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Click Delete Permanently.
3. Use Mail Client Rules
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Configure Outlook/Thunderbird to auto‑archive old mail.
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Set rules to move large attachments to local folders.
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Regularly empty Trash and Junk folders.
4. Backup and Remove Old Mail
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Export important messages to a local archive (PST for Outlook, MBOX for Thunderbird).
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Delete them from the server to free space.
Notes
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