PHPMailer不起作用，但没有错误，smtpdebug设置为2

Question

我已经经历了多个这样的问题，但似乎没有什么可以解决我的问题。我已将SMTP调试选项设置为2，检查了我的凭据（更改为用于发布的示例），还检查了smtp服务器和端口，并使用gmail和tls以及端口465。我使用ajax来单击提交表单数据在提交按钮上。

<?php

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

/* Exception class. */
require '/home/saveyamo/public_html/PHPMailer/src/Exception.php';

/* The main PHPMailer class. */
require '/home/saveyamo/public_html/PHPMailer/src/PHPMailer.php';

/* SMTP class, needed if you want to use SMTP. */
require '/home/saveyamo/public_html/PHPMailer/src/SMTP.php';


$errorMSG = "";


/* NAME */

if (empty($_POST["firstName"])) {
    $errorMSG = "<li class='danger'>Your first name is required</<li>";
} elseif (!filter_var($_POST["firstName"], FILTER_VALIDATE_INT) === false) {
    $errorMSG = "<li class='danger'>A number is not a valid name</<li>";
} else {
    $firstname = filter_var($_POST["firstName"], FILTER_SANITIZE_STRING);
}

if (empty($_POST["lastName"])) {
    $errorMSG = "<li class='danger'>Your last name is required</<li>";
} elseif (!filter_var($_POST["lastName"], FILTER_VALIDATE_INT) === false) {
    $errorMSG = "<li class='danger'>A number is not a valid name</<li>";
} else {
    $lastname = filter_var($_POST["lastName"], FILTER_SANITIZE_STRING);
}


/* EMAIL */

if (empty($_POST["email"])) {
    $errorMSG .= "<li class='danger'>Email is required</li>";
} elseif (!filter_var($_POST["email"], FILTER_VALIDATE_EMAIL)) {
    $errorMSG .= "<li class='danger'>Invalid email format</li>";
} else {
    $email = $_POST["email"];
}

/*phone*/
/*
if (empty($_POST["phone"])) {

    $errorMSG = "<li>Your phone number is required</<li>";

} else if (is_string($_POST["phone"])) {

  $errorMSG = "<li>That is not a valid phone number</<li>";

} else if (is_int($_POST["phone"])) {

    $phone = $_POST["phone"];

}
*/

function validate_phone_number($phones)
{
    // Allow +, - and . in phone number
    $filtered_phone_number = filter_var($phones, FILTER_SANITIZE_NUMBER_INT);
    // Remove "-" from number
    $phone_to_check = str_replace("-", "", $filtered_phone_number);
    // Check the lenght of number
    // This can be customized if you want phone number from a specific country
    if (strlen($phone_to_check) < 10 || strlen($phone_to_check) > 14) {
        return false;
    } else {
        return true;
    }
}

if (validate_phone_number($_POST["phone"]) == true) {
    $phone = $_POST["phone"];
} elseif (validate_phone_number($_POST["phone"]) == false) {
    $errorMSG = "<li class='danger'>That is not a valid phone number, try again. Be sure to include your area code.</li>";
} elseif (empty($_POST["phone"])) {
    $errorMSG = "<li class='danger'>Your phone number is required</<li>";
}



/* marina */

if (empty($_POST["marina"])) {
    $errorMSG = "<li class='danger'>Your marina is required</<li>";
} else {
    $marina = filter_var($_POST["marina"], FILTER_SANITIZE_STRING);
}

/* checkboxes */

$boxes = $_POST["boxes"];


/* MESSAGE */

if (empty($_POST["message"])) {
    $errorMSG .= "<li class='danger'>Message is required</li>";
} else {
    $message = filter_var($_POST["message"], FILTER_SANITIZE_STRING);
}


if (empty($errorMSG)) {
    $message = "Name: ".$firstname." ".$lastname."<br />".", Email: ".$email."<br />".", Phone: ".$phone."<br />".", Marina: ".$marina."<br />".", Interests: ".$boxes."<br />".", Message:".$message;
    $ok = "<li class='ok'>Awesome! Your message was sent, we will be in touch shortly.</li>";
    //echo json_encode(['code'=>200, 'msg'=>$message]);
    echo json_encode(['code'=>200, 'msg'=>$ok]);

    $to = "john.e.puaoi@gmail.com";
    $subject = "Contact";

    //mail($to, $subject, $message);
    //phpmailer start

    $mail = new PHPMailer(true);                              // Passing `true` enables exceptions
    try {
        //Server settings
    $mail->SMTPDebug = 2;                                 // Enable verbose debug output
    $mail->isSMTP();                                      // Set mailer to use SMTP
    $mail->Host = 'smtp.example.com';  // Specify main and backup SMTP servers
    $mail->SMTPAuth = true;                               // Enable SMTP authentication
    $mail->Username = 'example@example.com';                 // SMTP username
    $mail->Password = 'password';                           // SMTP password
    $mail->SMTPSecure = 'tls';                            // Enable TLS encryption, `ssl` also accepted
    $mail->Port = 587;                                    // TCP port to connect to

    //Recipients
        $mail->setFrom('web@example.com', 'Contact Form');
        $mail->addAddress('example@gmail.com');               // Name is optional
        $mail->addReplyTo('$email', '$firstname');

        //Content
    $mail->isHTML(true);                                  // Set email format to HTML
    $mail->Subject = 'Contact Form Submission';
        $mail->Body    = '$message';
        $mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

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

    //phpmailer end
    exit;
}


echo json_encode(['code'=>404, 'msg'=>$errorMSG]);