How to change from email address in php contact form

I have build a PHP contact form with validation which works fine .
But receiving problem. when submit i receive email but it is showing wrong email address in from area.
I want to show my actual address.
Here is live link http://www.luxpress.co.uk/checking/contact_form.php
when you submit enter your own email address you will receive confirmation email also.
check what i receive in from area.
from: 2.secureserver.net
to:
date: Wed, Aug 31, 2016 at 12:38 AM
I want to show

Here is my PHP validation form code

<?php
// Initialize variables to null.
$name ="";        //Sender Name
$email ="";     //Sender's email ID
$purpose ="";    //Subject of mail
$message ="";    //Sender's Message

$nameError ="";         
$emailError ="";
$purposeError ="";
$messageError ="";
$successMessage ="";

// Additional headers

$headers .= 'From: Birthday Reminder <birthday@example.com>' . "\r\n";

//On submitting form below function will execute

if(isset($_POST['submit']))
  {
  // checking null values in message
    if (empty($_POST["name"])){
        $nameError = "Name is required";
      }
   else {
       $name = test_input($_POST["name"]);
       // check name only contains letters and whitespace
       if (!preg_match("/^[a-zA-Z ]*$/",$name)){
            $nameError = "Only letters and white space allowed";
         }
     }
// checking null values in message
   if (empty($_POST["email"])) {
       $emailError = "Email is required";
      }
   else {
      $email = test_input($_POST["email"]);
      }
// checking null values in message  
   if (empty($_POST["purpose"])) {
      $purposeError = "Purpose is required";
     }
   else {
     $purpose = test_input($_POST["purpose"]);
    }
// checking null values in message
   if (empty($_POST["message"])) {
      $messageError = "Message is required";
     }
   else {
     $message = test_input($_POST["message"]);
    }
  // checking null values in all fields
if( !($name=='') && !($email=='') && !($purpose=='') &&!($message=='') )

  {// checking valid email
    if (preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) {
   
        $header= $name."<". $email .">";
                $headers = "CONTACT FORM";
     /* Let's prepare the message for the e-mail */
        $msg = "Hello! $name

Thank you...! For Contacting Us.

Name: $name
E-mail: $email
Purpose: $purpose
Message: $message
This is a Contact Confirmation mail.
We Will contact You as soon as possible.";

$msg1 = " $name Contacted Us.

Here are some information about $name.

Name: $name
E-mail: $email
Purpose: $purpose
Message: $message ";

/* Send the message using mail() function */
  if(mail($email, $headers, $msg ) && mail("kuhashmi@gmail.com", $header, $msg1 ))
    {
    $successMessage = "Thank you and that Red Dragon Digital Services received their enquiry and someone will get back to them.";
    }
  }
else { $emailError = "Invalid Email"; }

}
}
// function for filtering input values
function test_input($data) {
   $data = trim($data);
   $data = stripslashes($data);
   $data = htmlspecialchars($data);
   return $data;
}

?>

PHP:

 

Well... You're not at all using the From: header, so I'd suggest adding it, with the email you want to send from. Also, you're using quite a bit of regex to get heck email - php has gotten a FILTER function which can do this for you.

 

Thanks for your reply. Can you plz guide me or help to write header code. Because i have very little idea about header.
I appreciate if you paste the code here for header so i can use it properly.

 

You'll be better off using PHPMailer.