Determine Blacklist used to block IP

I administer an Exchange 2007 server.  I have set up antispam, and are using 4 blocklists. We have seen a few cases of legitimate email being blocked (in one case Gmail).  It seems that one (or more?) blocklists is a tad agressive. Problem is, once the user gets back to me, the IPs in question are no longer lised anywhere, so I cannot tell which block list is causing problmes.

Is there any way i can set up some sort of logging to determine which block list was used?

Thanks.
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Mal OsborneAlpha GeekAsked:
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mangofourCommented:
Hi,

Maybe try using a custom error message in the "Add IP Block List Provider" dialog box.

This will not give you a log of the blockings, but if a legit sender receives a customised bounce message, they can let you know what it was..  Have a different message for every blacklist.
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Mal OsborneAlpha GeekAuthor Commented:
Almost.  Contacting the sender is not viable, however the custom message is also in the SMTP log! This gives me a chance of finding it.
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