Well, that just shows what an idiot you can look when you read half a thread.
I started at dlbewley's post where he was talking about zmtrainsa and thought you were talking about the same thing.
There isn't a way round using zmtrainsa without passwords, I think you'd be better off voting for the bug dkarp mentioned above but that's your choice. It is rather risky, as has already been mentioned, trying to get a user to send junk/not junk to specific accounts.