What are common reasons for PHPMailer failing to connect to an SMTP server?

Common reasons for PHPMailer failing to connect to an SMTP server include incorrect SMTP server settings, firewall restrictions blocking the connection, and SSL/TLS certificate verification issues. To solve this problem, double-check the SMTP server settings, ensure that the correct port is being used, and verify that the firewall allows outgoing connections on that port. 

// Example PHP code snippet to set up PHPMailer with correct SMTP server settings
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

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

// Additional settings if needed
$mail->SMTPDebug = 2; // Enable verbose debugging output

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

Keywords

PHPMailer SMTP server connection failure authentication error error handling

Related Questions