Error "invalid maildirsize file" when updating mailbox quota on cPanel.

To resolve the problem "invalid maildirsize file"

Login to your cPanel server using SSH and run

 /scripts/generate_maildirsize <username>

You will need to read the information provided and then re-run the command with the additional option specified to ensure you are aware of what the command is going to do.

Once the command has been correctly ran with the additional parameter you will be able to update the quota within cPanel.

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