phpcms邮件发送失败

$mail->isSMTP();
$mail->Host = 'smtp.example.com';
$mail->SMTPAuth = true;
$mail->Username = 'your_email@example.com';
$mail->Password = 'your_password';
$mail->SMTPSecure = 'tls'; // 或者 'ssl'
$mail->Port = 587; // 或者 465

$mail->setFrom('from@example.com', 'Mailer');
$mail->addAddress('recipient@example.com', 'Joe User'); // 添加一个收件人
$mail->Subject = '这里是邮件主题';
$mail->Body    = '这是一封测试邮件';

ping smtp.example.com
telnet smtp.example.com 587

require 'vendor/autoload.php';

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

$mail = new PHPMailer(true);

try {
    // SMTP服务器配置
    $mail->isSMTP();
    $mail->Host = 'smtp.example.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'your_email@example.com';
    $mail->Password = 'your_password';
    $mail->SMTPSecure = 'tls';
    $mail->Port = 587;

    // 邮件内容
    $mail->setFrom('from@example.com', 'Mailer');
    $mail->addAddress('recipient@example.com', 'Joe User');
    $mail->Subject = '这里是邮件主题';
    $mail->Body    = '这是一封测试邮件';

    // 发送邮件
    $mail->send();
    echo '邮件发送成功';
} catch (Exception $e) {
    echo "邮件发送失败: {$mail->ErrorInfo}";
}