Is a valid SSL certificate necessary for PHPMailer to send emails successfully?

Yes, a valid SSL certificate is necessary for PHPMailer to send emails successfully, especially when using SMTP to send emails securely. Without a valid SSL certificate, the connection to the SMTP server may not be secure, leading to potential security risks and email delivery issues. 

// Example PHP code snippet using PHPMailer with a valid SSL certificate
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer();
$mail->isSMTP();
$mail->Host = 'smtp.example.com';
$mail->SMTPAuth = true;
$mail->Username = 'your@example.com';
$mail->Password = 'yourpassword';
$mail->SMTPSecure = 'ssl'; // Use SSL encryption
$mail->Port = 465;

// Add recipients, subject, body, etc.

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

Keywords

SSL certificate PHPMailer email sending SMTP authentication

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