How to increase cPanel mailbox space

If you want to increase the space in a cPanel mailbox, follow this guide.

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