$mail = new PHPMailer(); // Set the recipient list $mail->addAddress('john@example.com'); $mail->addAddress('jane@example.com'); $mail->addAddress('bob@example.com'); // Clear the recipient list $mail->ClearAddresses(); // Set a new recipient $mail->addAddress('mike@example.com'); // Send the email $mail->send();In this example, we first set the recipient list using the `addAddress` method. Then we clear the recipient list using `ClearAddresses` method. Finally, we set a new recipient using the `addAddress` method and send the email. PHPMailer is a package library that can be installed using Composer or manually downloaded from GitHub.