My two cents. Your best defense is that ServePath is quite irresponsible using SpamCop in a Production Environment if they haven't warned their users about the pro and cons of using SpamCop. Bottom line, it affects legitimate email from reaching the user.
As Marc mentioned, ServePath isn't using SPAMCOP to block E-mail -- they were just responding to a complaint from SPAMCOP.
However, despite SPAMCOP's flaws (mainly that it has never reported the % of bad-to-good E-mails, or other information to let the mailserver admins decide what is a good vs. bad mailserver, therefore generating more false positives than many people would like), it can be very useful in a weighting system (such as the one that Declude JunkMail introduced about 4 years ago). SPAMCOP has the makings of a very good spam test: it catches a very high percentage of spam, while having a low false positive rate. The bigger the difference between the two percentages, the better the test (when a weighting system is used -- without one, the false positive ratio becomes much more important).
-Scott
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