I am having issues getting a simple contact form getting past the junk filter and into the inbox. Is there something wrong with my code?

I have tried to set the email to 'not junk' in the 2 different email providers, but no change.

Here is my code:

Code HTML4Strict:
    <form method="post" action="mail_.php">
            <input name="name" placeholder="Type Here">
            <input name="email" type="email" placeholder="Type Here">
            <textarea name="message" placeholder="Type Here"></textarea>
            <label>*What is 7+3? (Anti-spam)</label>
            <input name="human" placeholder="Type Here">
            <input id="submit" name="submit" type="submit" value="Submit">

Code PHP:
    $name = $_POST['name'];
    $email = $_POST['email'];
    $message = $_POST['message'];
    $from = 'From: Contact Form'; 
    $to = 'my_email@gmail.com'; 
    $subject = 'Hello';
    $human = $_POST['human'];
    $body = "From: $name\n E-Mail: $email\n Message:\n $message";
  $headers .= "Content-type: text/plain; charset=utf-8\n";
  $headers .= "From: website user<someone_from@mysite.com> \n";
if ($_POST['submit']) {
    if ($name != '' && $email != '') {
        if ($human == '10') {				 
            if (mail ($to, $subject, $body, $from)) { 
	        echo '<p>Your message has been sent!</p>';
	    } else { 
	        echo '<p>Something went wrong, go back and try again!</p>'; 
	} else if ($_POST['submit'] && $human != '4') {
	    echo '<p>You answered the anti-spam question incorrectly!</p>';
    } else {
        echo '<p>You need to fill in all required fields!!</p>';

Any help would be much appreciated.