我正在尝试使用此PHP代码发送电子邮件：

require("PHPMailer-master/src/PHPMailer.php");

require("PHPMailer-master/src/SMTP.php");

require("PHPMailer-master/src/Exception.php");

$from = "admin@mydomain.com";

$namefrom = "admin";

$mail = new PHPMailer\PHPMailer\PHPMailer();

$mail->isSMTP(); // by SMTP

$mail->SMTPDebug = 1;

$mail->SMTPAuth = true; // user and password

$mail->Host = "mail.gandi.net";

$mail->Port = 110;

$mail->Username = $from;

$mail->Password = "Password123";

$mail->CharSet = 'UTF-8';

// $mail->SMTPSecure = ""; // options: 'ssl', 'tls' , ''

$mail->setFrom($from,$namefrom); // From (origin)

$mail->addCC($from,$namefrom); // Ther