Block emails/notifications from a specific space

This comes from a post on Answers.Atlassian.com which I believe would be a valid feature.

Is there a way to disable notifications in a space?

The use case would be that a company has multiple spaces but has a specific space which contains sensitive information that they would not like to have traveling over the internet via email. However, they would still like to be able to have this ability available for spaces which do not contain sensitive information. So the idea would be say an option in the space admin screens (say a check box) that when checked stops all emails related to that space from being created.

workaround in the meantime
Add a filter at the mail server level which blocks emails which contain links to the space in question. For example 'http://localhost:8090/display/TEST' so they are still created by Confluence but never actually get sent.