If you want to increase the space in a cPanel mailbox, follow this guide.
How to increase cPanel mailbox space
- Login to your Client Dashboard account
- Click on My Services button in the Welcome page
- Click on manage service button
- Login to cPanel link on the sidebar menu
- Click on the Email Accounts under the Email section
- Select the e-mail account that should have the mailbox increased in size, and click on manage
- Locate the storage option and select unlimited, or type the desired mailbox size
- Scroll down the page and click on update e-mail settings