a CGI/Perl script on a Web server) sending a request to an Internet Mail Server, to check if the email address exists and if a connection would be accepted by the Mail Server.
The CGI program is likely to be 'Form Mail' from Matt's Script Archive, which acts as a FORM to email gateway and is pre-installed by most Web Hosting providers.
Validating an email address using Java Script is browser-side function and you should be aware of the limitations of browser-side validation.
It contains a form with one box that is checked for "email validity".
You can add in more form elements into the form, as you would with any other form.
We have provided a series of preset demonstrations, a users test validation form, the corresponding HTML form input script and a Java Script script that contains our seven validation routines.