Lotus Domino 6.5.0/6.5.1 has a flaw that allows every user the ability to change their quota on an imap-enabled Domino Server to any value.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/33690/domino651.txt
Source: https://packetstormsecurity.com/files/33690/domino651.txt.html