What steps can be taken to troubleshoot and resolve authentication errors like "SMTP ERROR: AUTH command failed" in PHPMailer?

To troubleshoot and resolve authentication errors like "SMTP ERROR: AUTH command failed" in PHPMailer, you can try the following steps: 1. Double-check your SMTP server settings, including the hostname, port, username, and password. 2. Make sure that your SMTP server supports the authentication method you are using (e.g., SSL or TLS). 3. Verify that your username and password are correct and have not been changed. 

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

require 'vendor/autoload.php';

$mail = new PHPMailer();

$mail->isSMTP();
$mail->Host = 'smtp.example.com';
$mail->Port = 587;
$mail->SMTPSecure = 'tls';
$mail->SMTPAuth = true;
$mail->Username = 'your_username';
$mail->Password = 'your_password';

// Rest of your code for sending the email

Keywords

PHP PHPMailer SMTP authentication troubleshooting

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