Prevent sensitive information (code/comments) being sent in pull request email notifications

Allowing email settings to be controlled (on/off) on a per project basis AND/OR allowing the content of emails to be controlled at a more fine-grained level (e.g. just send link back to BitBucket Server with no content) would allow a company to better protect their intellectual property (and that of their customers) but still enable the convenience of using the email notifications for team coordination.