使用PHP的Mailgun

我一直在尝试使用PHP编码的Mailgun实现一个联系人服务。我收到以下错误：

下面是我的代码：

<?php

require("../includes/config.php");
require("../mailgun-php/vendor/autoload.php");
require("../phpmailer/_lib/class.phpmailer.php");
use Mailgun\Mailgun;

if($_SERVER["REQUEST_METHOD"] === "GET")
{
    render("contact-form.php", ["title" => "Contact us"]);
}

if($_SERVER["REQUEST_METHOD"] === "POST")
{     

    $mail = new PHPMailer;

    $mail->isSMTP();  // Set mailer to use SMTP
    $mail->Host = 'smtp.mailgun.org';  // Specify mailgun SMTP servers
    $mail->SMTPAuth = true; // Enable SMTP authentication
    $mail->Username = 'postmaster@sandboxb9cc446d8b7240efa59917c68fae6e50.mailgun.org'; // SMTP username from https://mailgun.com/cp/domains
    $mail->Password = '*SMTP password from sandbox domain'; // SMTP password from https://mailgun.com/cp/domains
    $mail->SMTPSecure = 'sll';   // Enable encryption, 'ssl'
            $mail->Port= '465';

    $mail->From = 'sandboxb9cc446d8b7240efa59917c68fae6e50.mailgun.org'; // The FROM field, the address sending the email 
    $mail->FromName = 'Enquiry bot'; // The NAME field which will be displayed on arrival by the email client
    $mail->addAddress('****@gmail.com');     // Recipient's email address and optionally a name to identify him
    $mail->isHTML(true);   // Set email to be sent as HTML, if you are planning on sending plain text email just set it to false

    // The following is self explanatory
    $mail->Subject = 'Client enquiry';
    $mail->Body    = $_POST["message"];

    if(!$mail->send())
    {  
        echo "Message hasn't been sent.";
        echo 'Mailer Error: ' . $mail->ErrorInfo . "\n";
    } 
    else 
    {
        redirect("confirmation.html");
    }
}
?>

---

我已经联系了邮枪工作人员，他们为我提供了极好的支持。问题在于如何指定端口。SSL的密码应为465，TLS的密码应为587。
您是否已在服务器上连接到smtp，并验证服务是否正在运行，以及您是否可以使用该密码进行连接？很抱歉，我对smtp的经验和知识非常有限。我怎么能这么做？要添加更多信息，我正在运行一个WAMP虚拟主机服务器。您需要搜索该消息-此问题有许多重复项。你也应该阅读文档，告诉你如何处理它。谢谢你的信息！我会尽快调查的。