In 1.0.1 version of this plugin default behavior has been accidentally changed to hide the email address (because if there is no system property it is treated as a false value). Changing that, so old behavior would be as default and old users won't see difference and won't have to change anything.
The way how Openfire operates with system properties is very confusing. When there is no property, the check works as false. But next time it doesn't. Will have to think again how to make it work as before by default.
I was wrong. When there is no such property, getBooleanProperty returns true, not false (as if the property would be there with true value, only false itself returns false). Will submit another PR.