How can PHP developers effectively debug and troubleshoot SMTP authentication issues in their mailer scripts?

SMTP authentication issues in mailer scripts can be effectively debugged and troubleshooted by checking the SMTP server settings, ensuring the correct authentication method is used, verifying the username and password, and examining error messages returned by the server. Additionally, using PHP's error handling functions like error_reporting() and ini_set('display_errors', 1) can help in identifying and resolving authentication problems. 

// Set the SMTP server settings
$mail->IsSMTP();
$mail->Host = 'smtp.example.com';
$mail->Port = 587;
$mail->SMTPAuth = true;
$mail->Username = 'yourusername@example.com';
$mail->Password = 'yourpassword';

// Set the authentication method
$mail->SMTPSecure = 'tls';

// Enable debugging to view error messages
$mail->SMTPDebug = 2;

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

Keywords

PHP debugging troubleshooting SMTP authentication

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