Each email sending script requirest SMTP Authentication.

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NOTE : make sure contacts.php are having 2 compulsary input box with the name as  :

 1. <input name="Name" size="30">
 2. <input name="Email" size="30">

The input box 'Name' and 'Email' must exist in your forms.
Feel free to add other input box in your forms (contacts.php)

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You will need to modify the following :

1. In submit.php :

$from="youremail.com<email@youremail.com>"; //From who that will appear when this form sent out email
$smtp_host ='mail.youremail.com';       //IP or host name
$smtp_username = 'email@youremail.com'; //email user, must created in your hosting control panel first !
$smtp_password = 'your email password'; //email password, must created in your hosting control panel first !

// Recipient of message (This can be changed via the form itself)

$recipient = 'yourID@domainname.com'; // you email address

// Subject of message (This can be changed via the form itself)

$subject = 'CONTACTS REQUEST';

// Do not include www, just the actual domain/ip address!

$referers = array('domainname.com', 'domainname.com', 'domain3.com');

// This is the page that users will be redirected to after the form is

// processed successfully.

$success_url = 'http://www.domainname.com/contacts.php?contacts=success';

// Your site URL

$siteurl = 'http://www.domainname.com';

You could download the sample script Here.

Download Winrar here : http://www.rarlab.com/download.htm