Do you have it set to Silently Fail (if destination is unreachable)? That means no log is generated - thus, hard to display it
- and no error is recorded
You can email (including 'only if error') but not if it is Silently Failing, because 'silent' means just that (do not email either).

You can email (including 'only if error') but not if it is Silently Failing, because 'silent' means just that (do not email either).