arkadaşlar bir türlü çözemedim. ne denesem olmadı. yardımcı olabilir misiniz?

sürekli "Oops! Something went wrong and we couldn't send your message." hatası alıyorum.

form html:

<form id="contact-form" action="mail.php" method="post">
<div class="form-box-five">
<div class="single-input">
<input name="con_name" type="text" class="input-box" required placeholder="Enter your name">
</div>
<div class="single-input">
<input name="con_email" type="email" class="input-box" required placeholder="Enter your email">
</div>
<div class="single-input">
<input name="con_offer" type="textarea" class="input-box" required placeholder="Your offer price $">
</div>

</div>
<div class="form-buttom-button">
<button type="submit" name="submit" class="btn btn--full btn--bg-2">Send my Offer</button>
</div>
<p class="form-messege"></p>
</form>

mail.php

<?php
header("Access-Control-Allow-Origin: *");
// Only process POST reqeusts.
if ($_SERVER["REQUEST_METHOD"] == "POST") {
// Get the form fields and remove whitespace.
$name = strip_tags(trim($_POST["con_name"]));
$name = str_replace(array("\r","\n"),array(" "," "),$name);
$email = filter_var(trim($_POST["con_email"]), FILTER_SANITIZE_EMAIL);
$message = trim($_POST["con_offer"]);

// 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 "Please complete the form and try again.";
exit;
}

// Set the recipient email address.
$recipient = "mail@mail";

// Set the email subject.
$subject = "Mail From $name";

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

?>