Reply to sender - PHP email

Here is my code for a email form. It works well, it sends to my email. But how can i make it so i can reply to the email that i received from the form? Would you be able to edit my code and put it in because im a BIG php noobie. many thanks!

<?php

$name = $_POST['name'];
$email = $_POST['email'];
$subject = $_POST['subject'];
$message = $_POST['message'];
$to = "adamgoredesign@gmail.com";

mail ($to, $subject, $message, "From: " . $name);

header('Location: contact_thankyou.html');

?>

you need to set the headers to be able to pass the sender email:

fx:

<?php
$to      = 'nobody@example.com';
$subject = 'the subject';
$message = 'hello';
$headers = 'From: webmaster@example.com' . "\r\n" .
    'Reply-To: webmaster@example.com' . "\r\n" .
    'X-Mailer: PHP/' . phpversion();

mail($to, $subject, $message, $headers);
?>

so your code will look something like this:

$name = $_POST['name'];
$email = $_POST['email'];
$subject = $_POST['subject'];
$message = $_POST['message'];
$to = "adamgoredesign@gmail.com";
$headers = 'From: '.$email."\r\n" .
        'Reply-To: '.$email."\r\n" .
        'X-Mailer: PHP/' . phpversion();

mail($to, $subject, $message, $headers, "From: " . $name);

header('Location: contact_thankyou.html');

Note: I never tested myself, I normally use smtp.mail class to do all this for me, since it is more easy, clean... just check it out...

then it will look something like this:

<?php
require 'class.phpmailer.php';

$mail = new PHPMailer;

$mail->IsSMTP();                                      // Set mailer to use SMTP
$mail->Host = 'smtp1.example.com;smtp2.example.com';  // Specify main and backup server
$mail->SMTPAuth = true;                               // Enable SMTP authentication
$mail->Username = 'jswan';                            // SMTP username
$mail->Password = 'secret';                           // SMTP password
$mail->SMTPSecure = 'tls';                            // Enable encryption, 'ssl' also accepted

$mail->From = 'from@example.com';
$mail->FromName = 'Mailer';
$mail->AddAddress('josh@example.net', 'Josh Adams');  // Add a recipient
$mail->AddAddress('ellen@example.com');               // Name is optional
$mail->AddReplyTo('info@example.com', 'Information');
$mail->AddCC('cc@example.com');
$mail->AddBCC('bcc@example.com');

$mail->Subject = 'Here is the subject';
$mail->Body    = 'This is the HTML message body <b>in bold!</b>';
$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

if(!$mail->Send()) {
   echo 'Message could not be sent.';
   echo 'Mailer Error: ' . $mail->ErrorInfo;
   exit;
}

echo 'Message has been sent';