Email quota - invalid maildirsize file

In some cases when a mailbox can get corrupt and needs a small tweak. There are many different email issues that can happen.

If you see when changing a quota in your cPanel, the following message "invalid maildirsize file.

The following will help 99% to fix the issue, its easy and don't be scared!

This would be a courier maildirsize file for the email account, which you can usually find by logging into cPanel, click on File Manager, click on the folder icon next to the mail folder, click on the folder icon next to the domain name, click on the folder icon next to the email user name, then click on the file called maildirsize in that folder (don't click on the icon but the file's name itself). In the upper right hand list of links, click to delete the file. Once you delete it, it will reform for the account automatically and it should then have the correct quota size.