[Security] Prevent Email address harvesting

According to wikipedia , Email harvesting is the process of obtaining lists of email addresses using various methods for use in bulk email or other purposes usually grouped as spam.
There is one of the method to In Prevent Email address harvesting, for detail please visit the site provided at the end of this blog post.

<style>
  my-email::after {
    content: attr(data-domain);
  }
  my-email::before {
    content: attr(data-user);
  }
</style>

<!-- Set data-user and data-domain as your
       email username and domain respectively -->

<my-email data-user="john" data-domain="gmail.com">@</my-email>

Result:

Reference:
http://www.labnol.org/internet/hide-email-address-web-pages/28364/
http://en.wikipedia.org/wiki/Email_address_harvesting