<form action="contact.php" method="post">
  <input type="text" name="name" placeholder="Your name">
  <input type="email" name="email" placeholder="Your email">
  <input type="text" name="message" placeholder="Your message">
  <input type="submit" value="Send">
</form>
<?php

// Get the form data
$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];

// Send the email
$headers = "From: $email";
$subject = "New message from $name";
$body = "$message";

mail("your@email.com", $subject, $body, $headers);

// Redirect to a thank you page
header("Location: thank-you.php");

?>