Why are Jenkins “extended emails” not including extended information?

Question

We installed email-ext 2.24.1 into Jenkins 1.447. We set \"Extended Email Notification\" \"Default Content\" to

$PROJECT_NAME - Build # $BUILD_NUMBER - $

Answer 1

In the Post build actions section, delete the E-mail notification altogether. This will ensure your instance is using only Editable email notification

This is possible in my version (1.477), not sure when this function of adding/deleting post-build actions released.