Html form and php to send to mail

I am building a website and want to add a form I did it in html and wanted to use php to retrieve the information via email.

so far I had the code and tested my server provider if support php and it does but when filling the form and submit it, i do not receive an email.

here is my code:

html

<h3>Request a Quote</h3> <p></p>

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

First Name: <input type="text" name="first_name"><br> Last Name: <input type="text" name="last_name"><br> Email: <input type="text" name="email"><br> Message:<br><textarea rows="5" name="message" cols="30"></textarea><br> <input type="submit" name="submit" value="Submit"> </form>

and php

<?php if(isset($_POST['submit'])) { $to = "vanportcleaners@gmail.com"; // this is your Email address $from = $_POST['email']; // this is the sender's Email address $first_name = $_POST['first_name']; $last_name = $_POST['last_name']; $subject = "Form submission"; $subject2 = "Copy of your form submission"; $message = $first_name . " " . $last_name . " wrote the following:" . "\n\n" . $_POST['message']; $message2 = "Here is a copy of your message " . $first_name . "\n\n" . $_POST['message'];

$headers = "From:" . $from;
$headers2 = "From:" . $to;
mail($to,$subject,$message,$headers);
mail($from,$subject2,$message2,$headers2); // sends a copy of the message to the sender
echo "Mail Sent. Thank you " . $first_name . ", we will contact you shortly.";

}

?>