How to Increase your cPanel Email Quota

We look at how to increase the size of your mailbox quota in cPanel to prevent emails being returned due to a full mailbox.

When an email account is created in cPanel, the email account quota is sometimes left on the default setting (often 100MB or 250MB). Your quota can quickly become full, even with a relatively quiet email address.

You can either set the quota option when creating email accounts, or adjust it later should you be short on disk space.

When an account exceeds its quota, no further emails to that email address will be delivered. A delivery failure notification will then be returned to the sender. An example of a notification is as follows:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
Mailbox quota exceeded

How to Increase your Email Quota in cPanel

This tutorial will show you how to increase your email quota in cPanel to one of your choosing.

How to Increase your Email Quota in cPanel
  1. Click on the Email Accounts Icon

    The first step is to access the email account administration area by clicking on the Email Accounts icon.

    This is shown boxed red in the image under the Mail section of cPanel.

    Click on the Email Accounts Icon
  2. Click the ‘Disk and Quota’ link for your chosen Email Account
    • After Step 1, you should have landed in the Email Accounts section of cPanel, with the “Email Accounts” tab active.
    • Click the “Disk and Quota Link” next to your chosen email account to reveal the settings.
    Click the 'Disk and Quota' link for your chosen Email Account
  3. Enter New Mailbox Quota

    You will now see an option to change the Mailbox Quota.

    You will have two options:

    • Custom Mailbox size: You can enter a custom size in MB.
    • Maximum Mailbox size: The second option will display the maximum mailbox size. This may be a limit set by your host, or simply say “unlimited.”

    When choosing a Mailbox Quota, you will need to ensure that it is:

    • Within your web hosting plan’s limitations.
    • Within the maximum allowed quota. On 32 bit operating systems the maximum permitted is 4096GB and 4TB on 64-bit operating systems.

    If your custom mailbox size does not comply with the above limits, you will see a red warning box appear.

    The mailbox quota amount does not include emails located in your mailbox’s trash folder.

    Enter New Mailbox Quota
  4. Click ‘Save’
    Once you are happy with your chosen settings, click the “Save” button to confirm the changes.
    Click 'Save'

Email Notifications

For shared hosting, many hosting providers will set a maximum mailbox size for your cPanel account.

If a limit is set for your cPanel account, it is likely that you will receive email notifications when you near your mailbox quota. By default (your host may have altered the specific thresholds in the cPanel WebHost Manager (WHM)), the following warnings will be sent:

  • Mailbox disk quota “warn” percentage — 80% Full
  • Mailbox disk quota “critical” percentage — 90% Full
  • Mailbox disk quota “full” percentage — 98% Full

If you receive a warning, you can take action. This may be increasing your mailbox quota as outlined above or bydeleting old emails.

Jonathan Griffin. Editor @ The Webmaster

About the author

Editor, Hosting Expert, SEO Developer, & SEO Consultant.

Jonathan is currently the Editor & CEO at The Webmaster. He is also an SEO Developer offering consultancy services, primarily to other web development companies. He specializes in the technical side of SEO, including site audits, development of SEO related features, and site structure & strategy.

In his spare time, Jonathan has a passion for learning. He regularly undertakes professional courses on subjects ranging from python, web development, digital marketing, and Advanced Google Analytics.

Read more about Jonathan Griffin on our About Page.