Formulário Spam

Front-end
, ,
#1

Preciso de ajuda para achar uma forma de acabar com os recebimentos de spams diários. Eu sou novo com programação web. O formulário que tenho no site é para receber cadastro de e-mail de clientes.

Segue o código:

<style>
  div.wpcf7-validation-errors {
    background: none repeat scroll 0 0 #FFF;
    border: 1px solid #73664A;
    color: #73664A;
    opacity: 0.55;
  }

  div.wpcf7-response-output {
    margin: -11em 0.5em 1em;
    padding: 0.2em 1em;
  }

  .wpcf7-form {
    margin: 0px 0;
  }

  .ajax-loader {
    display: none;
    opacity: 0;
  }

</style>

<div id="wpcf7-f43-p6-o1" class="wpcf7">
  <form novalidate="novalidate" class="wpcf7-form" method="post" action="/?page_id=47#wpcf7-f43-p6-o1">
    <div style="display: none;">
      <input type="hidden" value="43" name="_wpcf7">
      <input type="hidden" value="3.7" name="_wpcf7_version">
      <input type="hidden" value="pt_PT" name="_wpcf7_locale">
      <input type="hidden" value="wpcf7-f43-p6-o1" name="_wpcf7_unit_tag">
      <input type="hidden" value="487510b280" name="_wpnonce">
    </div>

    <input placeholder="Digite seu e-mail" style="border:0; background:none; font-size:18px; color:#929287; height:35px; width:210px; padding:0 0 0 5px; margin:1px 0 0 0;" type="email" aria-invalid="false" aria-required="true" name="your-email" class="wpcf7-form-control wpcf7-text wpcf7-email wpcf7-validates-as-required wpcf7-validates-as-email cufon"
    />
    <input type="submit" class="wpcf7-form-control wpcf7-submit" style="background:none; border:0; height:35px; width:30px; margin:1px 0 0 0;" value="&nbsp;" />
    <img class="ajax-loader" src="http://www.xxxxxxx.xxx.xx/wp-content/plugins/contact-form-7/images/ajax-loader.gif" alt="Enviando ..." style="visibility: hidden;">
    <div class="wpcf7-response-output wpcf7-display-none"></div>
  </form>
</div>
</div>