Mailbox permissions for an email account are broken and can't be fixed by the mailperm script

Question

How do you fix mailbox permissions for an email account that cannot be fixed with the mailperm script?

Answer

1. Log in to the server via SSH or access WHM's Terminal as the root user

2. Confirm the files and groups are owned by root by running the following command:

   # find /home/user/mail/ -group root -user root

   Note: You need to replace "user" with the cPanel account's username

3. If the files are owned by root, log in to the server and run the following command to backup the email files:

   # cp -Rav /home/user/mail{,.temp-backup}

   Note: You need to replace user with the cPanel account's username

4. Run the following command to fix the ownership of the mail files for the user:

   # find /home/user/mail -group root -user root -exec chown -Rv user:user {} \;

   Note: You need to replace all instances of "user" within the above command with the cPanel account's username