If they can't test you, they rub two neurons together and test you from another address. Perhaps you should read their FAQ before asking questions about their service. The only way you can prevent them from having any means of testing you is: Close your relay. Now, you can fool their automatic tests; but somebody will turn you in and they'll do a manual. It's harder to get removed from a manual, because they don't do automatic update testing on them. All of this is answered in their FAQ. At 06:43 PM 1/13/2000 -0600, you wrote:
If ORBS can't test you, how do you propose they determine if you're an open relay? Take your word for it? Accept a piece of spam from someone who says they received it which has your SMTP server's headers in it (which could just as well have been forged)?
Their answer was that if they can't test you, they have to assume you're operating open relays. I'd love to hear your thoughtful answer to the problem.