We installed email-ext 2.24.1 into Jenkins 1.447. We set \"Extended Email Notification\" \"Default Content\" to
$PROJECT_NAME - Build # $BUILD_NUMBER - $
There are several issues. First, you need to add a default recipient in the global config screen. The per job configuration is broken. The author claims it should not appear anymore, but it still does in the latest version.
Second, you should try specifying the content in the per job box. Delete the $DEFAULT_CONTENT and replace it with your template.
In my install, I was able to get it to work by doing that. I also had to hit advanced (in the per job config) and explicitly set triggers before it would send me email.
I've had trouble getting unit test failures to print, but CHANGES works.