mail.php

<?php
    $name = $_POST['name'];
    $email = $_POST['email'];
    $phone = $_POST['phone'];
    $message = $_POST['message'];
    $from = 'From: TangledDemo';
    $to = 'demo@tangledindesign.com';
    $subject = 'Hello';
    $human = $_POST['human'];

    $body = "From: $name\n E-Mail: $email\n Phone: $phone\n Message:\n $message";

    if ($_POST['submit'] && $human == '4') {
         if (mail ($to, $subject, $body, $from)) {
 	    echo '<p>Your message has been sent!</p>';
 	} else {
 	    echo '<p>Something went wrong, go back and try again!</p>';
 	}
     } else if ($_POST['submit'] && $human != '4') {
 	echo '<p>You answered the anti-spam question incorrectly!</p>';
     }
?>

<form method="post" action="index.php">

    <input name="name" placeholder="Full Name">
    <input name="email" type="email" placeholder="Email">
    <input name="phone" type="phone" placeholder="Phone">
    <textarea name="message" placeholder="Type Your Message Here..."></textarea>
    <label>*What is 2+2? (Anti-spam)</label>
    <input name="human" placeholder="Type Here">
    <input id="submit" name="submit" type="submit" value="Submit">

</form>