Putting aside the fact that my wife managed to fill up her inbox and blow her quota, do you really think it's helpful to send 1 quota warning message per minute to the inbox????
Having to clean these up only adds to the problem. Please update your postmaster configuration to something more reasonable.
@Zone99 can you please PM me the email you are having this issue with so i can investigate? The system should not be sending you that many emails about quota unless you are trying to send emails.
For example if you are using an email client, it can have a retry function where it just sits in the outbox continuously trying to send while the mailbox is full, so it would generate a new notice every time it tries to send.