Can someone help me with figuring out why this php script isn't sending an email?

Question

So i found this php code online on a treehouse article and i followed step by step. The code work perfectly a few times. perfect meaning i got the information to send to my email, but it ended up in my spam. Now none of that is happening and i didn't change a thing. The site is live now i figure try the form live instead of locally. Same problem. i host my site thru dreamhost, if that information helps any. Heres the site: www.dpwebdevelopment.com Heres the code:

        <form id="ajax-contact" class="center-block" method="POST" action="mailer.php">
          <div class="form-group">
            <label class="sr-only" for="name">Full name</label>

            <input id="name" class="form-control" type="text" name="name" placeholder="john Smith" required />
          </div>

          <div class="form-group">
            <label for="email" class="sr-only">Email Address</label>

            <input id="email" name ="email" class="form-control" type="email" placeholder="example@mail.com" required />
          </div>

          <div class="form-group">
            <label for="message" class="sr-only">Your Message</label>

            <textarea id="message" class="form-control" name="message" cols="30" rows="8" required></textarea>
          </div>

          <div class="form-group">
            <button class="btn btn-default center-block" type="submit" name="submit" value="Hire me">Hire me</button>
          </div>
        </form>```

<?php

// Only process POST reqeusts.
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Get the form fields and remove whitespace.
    $name = strip_tags(trim($_POST["name"]));
            $name = str_replace(array("\r","\n"),array(" "," "),$name);
    $email = filter_var(trim($_POST["email"]), FILTER_SANITIZE_EMAIL);
    $message = trim($_POST["message"]);

    // Check that data was sent to the mailer.
    if ( empty($name) OR empty($message) OR !filter_var($email, FILTER_VALIDATE_EMAIL)) {
        // Set a 400 (bad request) response code and exit.
        http_response_code(400);
        echo "Oops! There was a problem with your submission. Please complete the form and try again.";
        exit;
    }

    // Set the recipient email address.
    // FIXME: Update this to your desired email address.
    $recipient = 'dpwebdevelopment21@gmail.com';

    // Set the email subject.
    $subject = "New contact from $name";

    // Build the email content.
    $email_content = "Name: $name\n";
    $email_content .= "Email: $email\n\n";
    $email_content .= "Message:\n$message\n";

    // Build the email headers.
    $email_headers = "From: $name <$email>";

    // Send the email.
    if (mail($recipient, $subject, $email_content, $email_headers)) {
        // Set a 200 (okay) response code.
        http_response_code(200);
        echo "Thank You! Your message has been sent.";
    } else {
        // Set a 500 (internal server error) response code.
        http_response_code(500);
        echo "Oops! Something went wrong and we couldn't send your message.";
    }

} else {
    // Not a POST request, set a 403 (forbidden) response code.
    http_response_code(403);
    echo "There was a problem with your submission, please try again.";
}

?>```

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Dean Pierrot

Dean Pierrot

Can someone help me with figuring out why this php script isn't sending an email?