What common error message "550-Requested action not taken: mailbox unavailable550 Insufficient security or privacy level" may indicate when using PHPMailer to send emails via GMX?

This error message typically indicates that the email server (in this case, GMX) is rejecting the email due to security or privacy concerns. To solve this issue, you may need to enable SSL or TLS encryption in your PHPMailer configuration to ensure a secure connection to the email server. 

<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

try {
    $mail->isSMTP();
    $mail->Host = 'smtp.gmx.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'your_email@gmx.com';
    $mail->Password = 'your_password';
    $mail->SMTPSecure = 'tls'; // or 'ssl'
    $mail->Port = 587; // or 465
    $mail->setFrom('your_email@gmx.com', 'Your Name');
    $mail->addAddress('recipient@example.com', 'Recipient Name');
    $mail->isHTML(true);
    $mail->Subject = 'Subject';
    $mail->Body = 'Email body';

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

Keywords

PHPMailer GMX email sending SMTP error mailbox unavailable

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