If you want to allocate more space for your postmaster email account or other email accounts, you can follow the steps below to change it from your hosting control panel.
1. Login to your hosting control panel
2. Click on "EMAILS" >> "Emails" >> the person icon.
3. Select email account and Click on "Actions" >> "Update Disk Quota".
4. Fill the size that you want to allocate and then click on "Submit".