Contact form not working while click on submit button - php

Question

I was working with an HTML contact form, its action is a mail sending php script. But it is not working when i am clicking on the send button. I couldn't find any possible here. Please someone help me to fix this.
HTML form
<div class="contact-form">
<form action="sendmail.php" method="post">
<div class="control-group"><label class="nameLabel" for="name">Name</label> <input id="name" name="name" type="text" /></div>
<div class="control-group"><label class="emailLabel" for="email">Email</label> <input id="email" name="email" type="text" /></div>
<div class="control-group"><label class="messageLabel" for="message">Message</label><textarea id="message" name="message"></textarea></div>
<div class="control-group"><button type="submit">Send</button></div>
</form>
<h1 class="status-message-contact"></h1>
</div>
PHP code
<?php
if(isset($_POST['submit']))
{
$name = $_POST['name'];
$email = $_POST['email'];
$query = $_POST['message'];
$email_from = $name.'<'.$email.'>';
$to="sarath.sarigama#gmail.com";
$subject="WEB Enquiry!";
$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$headers .= "From: ".$email_from."\r\n";
$message="
Name:
$name
<br>
Email-Id:
$email
<br>
Message:
$query
";
if(mail($to,$subject,$message,$headers))
header("Location:../index.php?msg=Successful Submission! Thankyou for contacting us.");
else
header("Location:../index.php?msg=Error To send Email !");
//contact:-your-email#your-domain.com
}
?>

Answer 1

you dont have submit button name ,change name of the button
<button name='submit' type="submit">Send</button>
or use input tag
<input name='submit' type='submit'>

Answer 2

Replace
<button type="submit">Send</button>
with
<input type="submit" value="Send" />
And maybe add
<input type="hidden" name="submit" value="1" />
For the isset( $_POST['submit'] )