The Email Quota is available for saving your email data’s in a hard drive space given by your hosting provider based on the hosting plans you have taken. You can change the mail quota to unlimited or specify some megabytes for storing your mail data.
Step 1 – Login to cPanel
Step 2 – Click on Email Accounts option in cPanel
Step 3 – Select a particular Account and Click Change quota.
Step 4 – Change the Mailbox Quota by choosing either one of the two options
Step 5 – Enter the value and Click Change quota.