Unable to send HTML form data to email using PHP

Question

I have tried to send the form data to my email id. unfortunately it is not working and not getting any email from it.

I deployed into the server to test.

Experts inputs please?

here my try,

index.php

<form method="post" action="contact.php">
 <div class="form-group">
                <label>Name</label>
                <input type="text" class="form-control" name="sender">
            </div>
            <div class="form-group">
                <label>mail id</label>
                 <input type="text" class="form-control" name="senderEmail">
            </div>           
            <div class="form-group">
                <label>Mobile. No</label>
                <input type="text" class="form-control" name="mobile">
            </div>

            <input type="submit" name="submit"  class="btn btn-primary">

        </form> 

contact.php

<?php

if(isset($_POST['submit']) && !empty($_POST['submit'])) {
    $recipient="mohan@gmail.com";
    $subject="New mail";
    $sender=$_POST["sender"];
    $senderEmail=$_POST["senderEmail"];      
    $mobile=$_POST["mobile"];

    $mailBody="Name: $sender\nEmail: $senderEmail\n\n$message";

    mail($recipient, $subject, $mailBody, "From: $sender <$senderEmail>");

} 

?>