Account Creation Attempt Notification is an email that should be sent when someone tries to create an account with an email address that is already associated with an existing account. I started looking into this when a colleague reported receiving an empty email (no subject or body) in this situation. I haven’t been able to reproduce the empty email issue, so it may be an environment-related issue.
I suppose there’s a theoretical possibility that empty values originate from portletPreferences in CreateAccountMVCActionCommand#doProcessAction lines 257–264. I think it shouldn’t be possible to provide emailPasswordSentSubject or emailPasswordSentBody. The default value for those preferences is StringPool.BLANK. But by looking at the source code, the BLANK value shouldn’t flow through.
Anyway, it would be great to be able to localise these templates for other languages at least.