Reaproveitando código para não repetir em todos métodos

public function enviar_notificacao(){

    $mailconf = $this->setup_mail();

    $mailconf->isHTML(true);
    $mailconf->Subject = 'Here is the subject';
    $mailconf->Body    = 'This is the HTML message body <b>in bold!</b>';
}

private function setup_mail(){

    $mail = new PHPMailer;
    $mail->isSMTP();
    $mail->Host = 'smtp1.example.com;smtp2.example.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'user@example.com';
    $mail->Password = 'secret';
    $mail->SMTPSecure = 'tls';
    $mail->Port = 587;

    return $mail;
}