Mail Quotas: Adding a quota to a mailbox that already exceeds the desired limit?

What will happen if an InterWorx-CP admin sets a quota on a mailbox to a value that is lower than the space currently in use by the mailbox?

For example…
An admin did not originally set quotas but now wants to set them all to the same value to be fair and to stop a runaway disk consumption problem. The expectation is…

[LIST=1]

  • The users suddenly over quota will bounce messages.
  • The users suddenly over quota will receive warnings (if possible once over the limit).
  • [B]No mail will be purged automatically.[/B] [/LIST]

    Will this be the outcome?