阿里云ECS发送企业邮件

<?php
use PHPMailer\PHPMailer\PHPMailer;
require '../vendor/autoload.php';

$mail = new PHPMailer(true);

try {
    //Server settings
    $mail->CharSet = 'utf-8';
    $mail->SMTPDebug = 2;
    $mail->isSMTP();
    $mail->Host = 'ssl://smtp.mxhichina.com';   //使用阿里云注意使用ssl协议
    $mail->SMTPAuth = true;
    $mail->Username = 'xxx';
    $mail->Password = 'xxx';
    $mail->SMTPSecure = 'tls';
    $mail->Port = 465;  //阿里云开启端口

    //Recipients
    $mail->setFrom('xxx', 'xxxxxx');
    $mail->addAddress('xxx', 'Joe User');
    $mail->addAddress('xxx', 'Joe User');
    $mail->addReplyTo('xxx', 'Information');

    $mail->isHTML(true);
    $mail->Subject = '阿里企业邮箱发送自动发送邮件';
    $mail->Body    = '<b>报警了....</b>';
    $mail->AltBody = '报警邮件';

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