i use <input type="text" name="email" style="display: none;" value="" /> and verify that it's blank on the backend and if it's not I don't send the email. It

i use <input type="text" name="email" style="display: none;" value="" /> and verify that it's blank on the backend and if it's not I don't send the email. It doesn't block 100% but I get very few come through.