How can one troubleshoot "Authentication failed: wrong user/password" errors when using PHPMailer with SMTP on a V-Server like Strato?

To troubleshoot "Authentication failed: wrong user/password" errors when using PHPMailer with SMTP on a V-Server like Strato, double-check the username and password you are using for authentication. Make sure they are correct and properly configured in your PHP code. Additionally, ensure that the SMTP server settings provided by your hosting provider are accurate. 

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

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

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

    // Rest of your mailing code

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

Keywords

PHPMailer SMTP V-Server Strato Authentication_failed

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