Open relay test results

Hi all. I'm a new Ironport user, having just started working for a company that had a Spam and Virus Blocker already up and running.
We've been put on some blacklists for acting as an open relay. Apparently my predecessor had already done much of the work involved in fixing this problem, but we're still on blacklists. I'm not sure when the last time we really were an open relay was; it could have been before the Ironport was ever installed. I want to clear our name, but before I start requesting removals, I want to be 100% sure that the problem is addressed.
I've run some online open relay tests, and most report that we are not an open relay, but when I tried http://www.rbl.jp/svcheck.php , 5 of their 19 tests came back as "accepted".
I searched the Ironport knowledge base and found that our settings already match the recommendation -- our RAT is set to reject "all other recipients".
Here are the recipients from the tests that came back as "accepted":
>>> RCPT TO: <rlytest%[email protected]>
>>> RCPT TO: <"[email protected]"@server01.mycompany.com>
>>> RCPT TO: <h.rbl.jp![email protected]>
>>> RCPT TO: <"rlytest%h.rbl.jp"@mycompany.com>
>>> RCPT TO: <"[email protected]"@mycompany.com>
"server01" is the name of our Exchange server. Our firewall is set to forward port 25 to the Ironport.
Some of the tests suggested that even an "accepted" message was not a sure sign of being an open relay, and that the mail server might accept it and then silently discard it anyway. Is this something I need to fix, or is it already handled by the Ironport? How can I tell for sure? I've considered telnet'ing in from my home PC and reproducing the commands shown on that site using a real email address of my own, but I'm not really confident in this procedure, or in the procedure of "properly" malforming email addresses. Any advice?
Can anyone recommend further steps for me to take to be sure we are not operating an open relay?

Thank you for the quick reply, Steven.
It seems as though my Ironport does not have the "findevent" command. When I tried it I got an "unknown command: findevent" message, and the "help" message does not list findevent. Are you sure that command exists in the Spam and Virus Blocker, and not just other Ironport models?
I notice that there are two upgrades available to download for my Ironport, so maybe it's just that my current version is too old. I'm not sure I'm daring enough to install the upgrades during business hours, so I'll probably do that on the weekend.
Thanks again.

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    Relay Test State Machine.vi ‏207 KB

    Hi James,
    I've tried to implement some logic as suggested.  I can now get the 1A coil to engauge after the nth cycle and I think it's taking a measurement, but can't seem to get the 15 A coil to disengauge at the same moment, which is crucial else the measurement will be across 16 A rather than just the 1 A.  Any ideas?  I just want to get it working so we can get started with testing.
    I'm going to get my supervisor to book me on a course at Newbury for future projects, it's very difficult to pick up of your own back.
    Kind regards,
    Andy
    (Helps if I attach it)
    Attachments:
    Relay Test State Machine.vi ‏209 KB

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