What steps can be taken to troubleshoot PHPMailer connection issues with SMTP servers?

If you are experiencing connection issues with PHPMailer and SMTP servers, you can troubleshoot the problem by checking your server's firewall settings, ensuring that the SMTP server is reachable, verifying the SMTP server credentials, and confirming that the correct port is being used. 

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

$mail = new PHPMailer();

// Set the hostname of the mail server
$mail->Host = 'smtp.example.com';

// Set the SMTP port number
$mail->Port = 587;

// Enable SMTP authentication
$mail->SMTPAuth = true;

// Set the username and password for the SMTP server
$mail->Username = 'your_smtp_username';
$mail->Password = 'your_smtp_password';

// Set the encryption method to use (TLS or SSL)
$mail->SMTPSecure = 'tls';

// Check if the connection is successful
if (!$mail->smtpConnect()) {
    echo 'Failed to connect to SMTP server';
} else {
    echo 'Connected to SMTP server successfully';
}

Keywords

PHPMailer SMTP troubleshooting connection issues error codes

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