Every email address you have with Email Hosting or Web Hosting service, has a specific email quota when you create them, by default it is 250MB. You may do changes with the email quota when you first create an email or do it later.
Here’s how you can change your mailbox quota via cPanel.
Step 1. Log in to the cPanel using this link format: http://yourdomain.com/cpanel/
Replace yourdomain.com with the Main Domain Name connected to your hosting.
Step 2. Click Email Accounts under the Email Panel.
Step 3. Locate the email address that you’d like to change mailbox quota, and click Manage.
Step 4. Under Storage, change the Allocated Storage Space.
Step 5. Click Update Email Settings.
|Note: You may change using MB, GB, TB, and PB for the file size. However, you may need to consider the plan you are currently using. You may have the limit for each of your email accounts or use Unlimited.|