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Upgraded to 1.4 and still getting lots of spam

I recently upgraded to 1.4 after getting hit hard by a spambot, but even after going to 1.4 I'm continuing to get spam.

Using Q&A in registration
Have Spam and Disposable email addresses
Spam settings are set to 1, 3, 7, 5

Is there anything else I should add or do to prevent users from posting spam?