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: firstname.lastname@example.org 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.
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, SEO Consultant, & Developer.
Jonathan Griffin is The Webmaster's Editor & CEO, managing day-to-day editorial operations across all our publications. Jonathan writes about Development, Hosting, and SEO topics for The Webmaster and The Search Review with more than nine years of experience. Jonathan also manages his own SEO consultancy, offering SEO developer services. He is an expert on site-structure, strategy, Schema, AMP, and technical SEO. You can find Jonathan on Twitter as @thewebmastercom.