如何将“发件人电子邮件”更改为表单中的电子邮件

我在下面有以下表格，我一直在努力弄清楚如何将发件人电子邮件地址更改为不同的地址。

目前，它使用php服务器和正在使用的电子邮件的自动回复正在发送自动回复，它只是造成了很大的混乱。任何帮助将不胜感激。

<?php

if(isset($_POST['submit'])) {

    //create an empty errors array
    $errors = array();
    //our form has been submitted
    if($_POST['name'] == "") {
        //the name field is empty
        $errors[] = "The name field is empty";
    }
    if($_POST['email'] == "") {
        //the email field is empty
        $errors[] = "The email field is empty";
    }
    if($_POST['comment'] == "") {
        //the comment field is empty
        $errors[] = "The comment field is empty";
    }


    if($_POST['phone'] == "") {
        //the comment field is empty
        $errors[] = "The phone field is empty";
    }

            if($_POST['passengers'] == "") {
        //the comment field is empty
        $errors[] = "The passengers field is empty";
    }

    if($_POST['destination'] == "") {
        //the comment field is empty
        $errors[] = "The destination field is empty";
    }
    if(!stripos($_POST['email'], '@')) {
        $errors[] = "The email address was not valid";
    }
    if(count($errors) == 0) {
        $sendto = "inquiry@maximtours.net";
        $title = "Contact Form";
        $email = $_POST['email'];
        $message = "Name: ".$_POST['name']. "'n".
            "Mail: ".$_POST['email']. "'n".
            "Date of Travel: ".$_POST['month'].". " .$_POST['day'].", " .$_POST['year'] ."'n".
            "Phone No: ".$_POST['phone']. "'n".
            "Number of Passengers: ".$_POST['passengers']. "'n".
            "Traveling From: ".$_POST['city']. "'n".
            "Destination: ".$_POST['destination']. "'n".
            "Comment: ".$_POST['comment']. "'n";

        $headers = "From: " . $_POST['email'] . "'r'n" .
            "Reply-To: " . $_POST['email'] . "'r'n" .
            "X-Mailer: PHP/" . phpversion();

           if(mail($sendto, $title, $message, $email, 'inquiry@maximtours.net'.$email)) {
                $success = true;
            } else {
                $success = false;
            }

    } 
}
?>
<?php
if(isset($_POST['submit'])) {
    if($success == true && count($errors) == 0) {
        echo "<h2>Thanks for getting in touch!</h2>";

    }
    if(count($errors) == 0 && $success == false && isset($_POST['submit'])) {
        echo '<h2>There was a problem with our form. Please email us directly via inquiry@maximtours.net.</h2>';
    }

    if(isset($_POST['submit']) && $success == false && count($errors) > 0) {
        echo "<ul>";
        foreach($errors as $e) {
            echo "<li>$e</li>";
        }
        echo "</ul>";
    }
}
?>