PHPMailer not posting

所以我试图在我的网站上使用PHP mailer，但它没有发布到电子邮件

这是代码：

顶部：

发送地点：

require 'vendor/autoload.php';
//Instantiation and passing `true` enables exceptions
$mail = new PHPMailer(true);

try {
//Server settings
$mail->SMTPDebug = SMTP::DEBUG_SERVER;                      //Enable verbose debug output
$mail->isSMTP();                                            //Send using SMTP
$mail->Host       = 'smtp.office365.com';                     //Set the SMTP server to send through
$mail->SMTPAuth   = true;                                   //Enable SMTP authentication
$mail->Username   = 'maileremail';                     //SMTP username
$mail->Password   = 'mailerpassword';                               //SMTP password
$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;         //Enable TLS encryption; `PHPMailer::ENCRYPTION_SMTPS` encouraged
$mail->Port       = 587;                                    //TCP port to connect to, use 465 for `PHPMailer::ENCRYPTION_SMTPS` above

//Recipients
$mail->setFrom('maileremail', 'Mailer');
$mail->addAddress(myemail', 'Joe User');     //Add a recipient

//Content
$mail->isHTML(true);                                  //Set email format to HTML
$mail->Subject = 'Here is the subject';
$mail->Body    = 'This is the HTML message body <b>in bold!</b>';
$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

$mail->send();
echo 'Message has been sent';
} catch (Exception $e) {
echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";
}
?>

我试过了所有的东西，但还是发不出来。