What are some common reasons for the error "SMTP Error: Could not connect to SMTP host" when using PHPMailer on a different server?

The error "SMTP Error: Could not connect to SMTP host" typically occurs when there is an issue with the SMTP server configuration or network connectivity. To solve this issue, you should first verify that the SMTP server settings are correct and that the server is reachable from the server where PHPMailer is running. Additionally, check if there are any firewall rules blocking the connection to the SMTP server. 

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

$mail = new PHPMailer(true);

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

    $mail->setFrom('from@example.com', 'Your Name');
    $mail->addAddress('recipient@example.com', 'Recipient Name');

    $mail->isHTML(true);
    $mail->Subject = 'Test Email';
    $mail->Body = 'This is a test email';

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

Keywords

PHP PHPMailer SMTP connection error server configuration

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