Here are some online resources for checking spam scores:
- http://www.port25.com/support/authentication-center/email-verification/
- http://isnotspam.com/
- http://spamscorechecker.com/
- http://spamcheck-services.com/
Or for offline checking:
- http://www.mailingcheck.com/download-spam-checker/
And here some tips to avoid False Positives: http://wiki.apache.org/spamassassin/AvoidingFpsForSenders
