What is the common error message encountered when using PHP mailer for sending emails to addresses outside the domain?

When using PHP mailer to send emails to addresses outside the domain, a common error message is "SMTP Error: The following recipients failed". This error occurs when the recipient email address is not recognized or the domain is not properly configured to send emails externally. To solve this issue, make sure to specify a valid recipient email address and ensure that your SMTP server is configured to send emails to external domains. 

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

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

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

    $mail->setFrom('your@example.com', 'Your Name');
    $mail->addAddress('recipient@example.com', 'Recipient Name');
    
    $mail->isHTML(true);
    $mail->Subject = 'Subject';
    $mail->Body = 'Message body';

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

Keywords

PHP mailer email sending domain error message outside addresses

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