Earlier I had used the Fast Secure Contact Form plugin, an very good plugin. But Contact Form 7 is leagues ahead [ I think ]. I spent just about 43 minutes to achieve the entire cycle: upload, activate, create, captcha [ that entails the installation of Really Simple Captcha plugin ] and a fair amount of reading. All these in 43 minutes :-) No wonder this plugin has been downloaded 13,000,000 times!
Thank you for this awesome plugin!