Website contact form not working properly [duplicate] - php

Question

This question already has answers here:
PHP mail function doesn't complete sending of e-mail
(31 answers)
Closed 4 years ago.
I am fairly new to coding and am having an issue with my website contact form. It won't allow me to receive email when the form is filled and submit button clicked.
I know nothing about PHP and it's obvious something is missing or incorrect. I've included only the relevant portions of the file...thanks for any help I can get!
<div id="page_4">
<div id="wrapper">
<form action="contact form.php" method="post">
<label for="fname">Name</label>
<input type="text" name="name" placeholder="Full name...">
<label for="email">Email</label>
<input type="text" name="email" placeholder="...">
<label for="phone">Phone</label>
<input type="text" name="phone" placeholder="...">
<label for="subject">Subject</label>
<input type="text" name="subject" placeholder="...">
<label for="detail">Project Detail</label>
<textarea name="detail" placeholder="Please use detail if possible..." style="height:200px"></textarea>
<label for="deadline">Project Deadline (MO/DY/YR)</label>
<input type="text" name="deadline" placeholder="...">
<input type="submit" value="Submit">
</form>
</div>
</div>
<?php
if (isset($_POST['submit'])) {
$name = $_POST['name'];
$subject = $_POST['subject'];
$mailfrom = $_POST['mail'];
$message = $_POST['message'];
$mailTo = "mark#markabove.com";
$headers = "From: ".$mailFrom;
$txt = "You have recieved an e-mail from ".$name."\n\n".$message;
mail($mailTo, $subject, $txt, $headers);
header("Location: contact.html?mailsend");
}
?>

Answer 1

The URL for the form action tag has a space in it. Perhaps change it to contact-form.php.