We can validate email address at client side and server side.
You can leave a comment, or trackback from your own site.
In most of the application there is a need to validate email address on the form.
Example Markup and script are provided for you to copy/paste into your HTML editor for inclusion on a web page.
If you are intending to include a 'Contact Us' page on your Website then you will need to create a more comprehensive FORM that communicates with a CGI program located on your site's Web server.