SMTP通知：在检查是否连接时发现了EOF。

Question

<?php
// Import PHPMailer classes into the global namespace
// These must be at the top of your script, not inside a function
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

require 'PHPMailer/src/Exception.php';
require 'PHPMailer/src/PHPMailer.php';
require 'PHPMailer/src/SMTP.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.gmail.com';                    // Set the SMTP server to send through
    $mail->SMTPAuth   = true;                                   // Enable SMTP authentication
    $mail->Username   = '[email protected]';                     // SMTP username
    $mail->Password   = 'mygmailpassword';                               // SMTP password
    $mail->Port       = 465;                                    // TCP port to connect to, use 465 for `PHPMailer::ENCRYPTION_SMTPS` above

    //Recipients
    $mail->setFrom('[email protected]', 'Courses');
    $mail->addAddress('[email protected]');     // Add a recipient
    $mail->addReplyTo('[email protected]', 'No-reply');
    // 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}";
}
?>

这是我得到的错误

2020-05-06 07:59:56 SERVER -> CLIENT:
2020-05-06 07:59:56 SMTP NOTICE: EOF caught while checking if connected
SMTP Error: Could not authenticate.
SMTP Error: Could not authenticate.
Message could not be sent. Mailer Error: SMTP Error: Could not authenticate.

我把端口改成了465改成了587，但是没有用。我搜索了一下这个问题，但大部分答案都是端口改成了465，但没有用。我在代码中做错了什么.对不起，我是初学者。

Answer 1

试着加上这个。这为我解决了问题!

$mail->SMTPSecure = 'ssl';

确保你没有开启两步验证。

值得注意的是，有些SMTP服务器会阻止连接。有些SMTP服务器不支持SSL（或TLS）连接。