Broke my contact form

After I installed this, no test message I tried to send myself would go through. Every attempt was met with the orange-border error message, indicating a spam fail.
My comment blacklist was empty, so that couldn’t have been the cause. Plus, the same message worked fine after disabling this plugin.

Besides, Contact Form 7 added nonce verification in version 3.1, so I guess I shouldn’t need this anyway.