I will create a PHP contact form with Google's No Captcha reCaptcha. As Google says, Its hard on bots and easy on humans. The captcha will ask Are you a robot? with a checkbox. Its fun and intutive.
Got tired receiving spam mails? Customer complaining about hard captcha? lost potential customers? decreased conversions? if your answer is yes, then you'll need a SPAM protected contact form for your website.
Stop losing your customers. Implement no Captcha reCaptcha.