Add Really Simple Captcha to reduce spam. As with all plugins, development is ongoing. It isn't perfect, but it works all the time for me across many major hosts. Easy to format layout and is never the plugin that jacks up something in my dozens of WordPress sites.
By the way it is free, not loaded with "buy my other junk" or gets featured disabled to drive you to pay versions. It is so easy it is likely you won't have to use any codex/forums to format and install in minutes.
Way smarter than posting your email address as a point of contact in any website.