Most of the time this happens due to permission issue, we can easily resolve this with below steps:
To resolve this issue you can run below script:
	
	
	
		
Sometimes email account shows negative size for few cpanel users, you can resolve this by using below script:
	
	
	
		
								To resolve this issue you can run below script:
		Code:
	
	/scripts/mail per username
	
		Code:
	
	/scripts/generate_maildirsize -confirm cPanelusername