Forgot password link isn't working, how to enable messaging?

[Antidote]

I'm having trouble with the forgot password link on my login page, gives me the "Password restore is unavailable due to system error #1002. Call your provider" error message. I managed to find this KB article but it seems very old as I can't find anything it's talking about. http://kb.odin.com/en/1163

Any ideas on how to enable this in plesk 8.3?