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Invalid maildirsize file cPanel :
This error is occurred because of the mail directory. For fixing this just follow the steps below,
Log in to cPanel
Click on the File Manager
Then from the side tab, explore the mail folder by clicking the + symbol on the folder
Now explore the folder that is having the name of the domain,
Explore the folder named as your email user name
Then you can see the list of files in the right side window.
Just click the file named maildirsize from there and delete the file using the delete option.
Once you delete it, it will reform for the account automatically with correct quota size.
This will fix the issue.
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