///// content of newsletter.php
<?php
//If the form is submitted
if(isset($_POST['submit'])) {

	//Check to make sure sure that a valid email address is submitted
	if(trim($_POST['email']) == '')  {
		$hasError = true;
	} else if (!preg_match("/^[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}$/", trim($_POST['email']))) {
		$hasError = true;
	} else {
		$email = trim($_POST['email']);
	}

	//If there is no error, send the email
	if(!isset($hasError)) {
		$emailTo = 'test@test.com'; //Put your own email address here
                $subject = "Newsletter subscription";
		$body = "Email: $email";
		$headers = "From: $email";

		mail($emailTo, $subject, $body, $headers);
	}

	die("<span class='success'>Success! Your message has been sent.</span>");
}
?>


/// content of mail.php
<?php
//If the form is submitted
if(isset($_POST['submit'])) {

	//Check to make sure that the name field is not empty
	if(trim($_POST['contactname']) == '') {
		$hasError = true;
	} else {
		$name = trim($_POST['contactname']);
	}

	//Check to make sure that the subject field is not empty
	if(trim($_POST['subject']) == '') {
		$hasError = true;
	} else {
		$subject = trim($_POST['subject']);
	}

	//Check to make sure sure that a valid email address is submitted
	if(trim($_POST['email']) == '')  {
		$hasError = true;
	} else if (!preg_match("/^[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}$/", trim($_POST['email']))) {
		$hasError = true;
	} else {
		$email = trim($_POST['email']);
	}

	//Check to make sure comments were entered
	if(trim($_POST['message']) == '') {
		$hasError = true;
	} else {
		if(function_exists('stripslashes')) {
			$comments = stripslashes(trim($_POST['message']));
		} else {
			$comments = trim($_POST['message']);
		}
	}

	//If there is no error, send the email
	if(!isset($hasError)) {
		$emailTo = 'test@test.com'; //Put your own email address here
		$body = "Name: $name \n\nEmail: $email \n\nSubject: $subject \n\nComments:\n $comments";
		$headers = "From: $email";

		mail($emailTo, $subject, $body, $headers);
	}

	die("<span class='success'>Success! Your message has been sent.</span>");
}
?>