How can mismatched certificate errors be resolved when using a mailer class like PHPMailer or SwiftMailer for email sending in PHP?

When using a mailer class like PHPMailer or SwiftMailer for email sending in PHP, mismatched certificate errors can be resolved by disabling SSL verification or by providing the correct SSL certificate. This can be done by setting the 'SMTPOptions' parameter to disable SSL verification or by setting the 'SMTPOptions' parameter with the path to the correct SSL certificate. 

// Example of resolving mismatched certificate errors in PHPMailer
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;

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

// Disable SSL verification
$mail->SMTPOptions = array(
    'ssl' => array(
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    )
);

$mail->setFrom('your@example.com', 'Your Name');
$mail->addAddress('recipient@example.com', 'Recipient Name');
$mail->Subject = 'Test Email';
$mail->Body = 'This is a test email';

if ($mail->send()) {
    echo 'Email sent successfully';
} else {
    echo 'Error sending email: ' . $mail->ErrorInfo;
}

Keywords

SSL certificate PHPMailer SwiftMailer email sending

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