PHPmailer将电子邮件发送到Outlook帐户中的垃圾文件夹

Question

我正在网站上使用PHPMailer，以便将用户信息发送到我的Outlook电子邮件中。电子邮件发送过程看起来一切正常，但是我面临的问题是，用户发送给我的所有信息都会通过Outlook发送到垃圾文件夹。这是我的代码：

<?php

    use PHPMailer\PHPMailer\PHPMailer;
    use PHPMailer\PHPMailer\Exception;

    require_once('private/initialize.php');
    require_once('private/PHPMailer/src/Exception.php');
    require_once('private/PHPMailer/src/PHPMailer.php');
    require_once('private/PHPMailer/src/SMTP.php');

    // SERVER SIDE VALIDATION
    $errors = [];
    $user = [];
    $user['name'] = '';
    $user['email'] = '';
    $user['telephone'] = '';
    $user['address'] = '';
    $user['city'] = '';
    $user['date_time'] = '';
    $success = '';
    $failed = '';

    if (is_post_request()) {

        $user = [];
        $user['name'] = $_POST['name'] ? $_POST['name'] : '';
        $user['email'] = $_POST['email'] ? $_POST['email'] : '';
        $user['telephone'] = $_POST['telephone'] ? $_POST['telephone'] : '';
        $user['address'] = $_POST['address'] ? $_POST['address'] : '';
        $user['city'] = $_POST['city'] ? $_POST['city'] : '';
        $user['date_time'] = $_POST['date_time'] ? $_POST['date_time'] : '';

        $mail = new PHPMailer(true);

        $email_body = "I hope it worked";
        $user_email = $user['name'];

        $mail->SMTPDebug = 0;
        $mail->Port = 587;
        $mail->Host = "smtp-mail.outlook.com";
        $mail->SMTPAuth = true;
        $mail->SMTPSecure = 'tls';
        $mail->Username = 'example@outlook.com';
        $mail->Password = '*********';

        // Recipients
        $mail->setFrom($user['email'], $user['name']);
        $mail->addAddress('example@outlook.com', 'My name');
        $mail->addReplyTo($user['email'], $user['name']);

        // Content
        $mail->IsHTML(true);
        $mail->Subject = $user_email;
        $mail->Body = $email_body;

        if (!$mail->send()) {
           $failed = "<div class='failed-message'>The email was not sent!</div>";
        } else {
           $success = "<div class='success-message'>Tack " . $user['name'] . " för din bokining. Vi återkommer snart.</div>";
           $user = [];
           $user['name'] = '';
           $user['email'] = '';
           $user['telephone'] = '';
           $user['address'] = '';
           $user['city'] = '';
           $user['date_time'] = '';
        }

    }

    else {
        $user = [];
        $user['name'] = '';
        $user['email'] = '';
        $user['telephone'] = '';
        $user['address'] = '';
        $user['city'] = '';
        $user['date_time'] = '';
    }

?>

我尝试了许多解决方案，但没有一个起作用，所以请告诉我该怎么做才能解决此问题。谢谢