php email form

gistfile1.txt

<?php

if($_POST["submit"]) {
    
	$toEmail=$_POST["toEmail"];
	$fromEmail=$_POST["fromEmail"];
	$subject=$_POST["subject"];
    $message=$_POST["message"];
    $mailBody="From: $fromEmail\nTo: $toEmail\n\n$message";
    mail($toEmail, $subject, $mailBody, "From: $fromEmail <$fromEmail>");
    $thankYou="<p>Thank you! Your message has been sent.</p>";
}
?>
    <?=$thankYou ?>
    <form method="post" action="/test/">
        <label>To email:</label>
        <input name="toEmail">

		<label>From email:</label>
        <input name="fromEmail" value="">

		<label>Subject:</label>
        <input name="subject">

        <label>Message:</label>
        <textarea rows="5" cols="20" name="message"></textarea>

        <input type="submit" name="submit">
    </form>