Send e-mail to all active users when the security level change

[Roland Schenker]

Send e-mail to all active users when the security level in an issue change

[Nic Brough -Adaptavist-]

JIRA notifies on events, not changes of field.  Issue security changes should be sending out "issue updated" events though, so you should be catching them.  (Note that it won't email people who can't see the issue)