php mail function

php

<?php

class IwMail {
    protected $subject;
    protected $headers;
    protected $content;
    protected $to;
    protected $from;
    public $mail;

    public function __construct($subject, $to, $content="", $from="Admin <admin@gmail.com>") {
        $this->subject = $subject;
        $this->to = $to;
        $this->content = $content;
        $this->from = $from;
    }

    public function mail() {
        $this->headers = 'From: ' . $this->from . " \r\n" .
            'Reply-To: ' . $this->to . " \r\n" .
            'X-Mailer: PHP/' . phpversion();
        echo "header: " . $this->headers;
        $ret = mail($this->to, $this->subject, $this->content, $this->headers);
        echo "status($ret): email sent to " . $this->to;
    }

    public function gmail_setup($username="", $password="") {
        $this->headers = "MIME-Version: 1.0\n"
            . "Content-type:text/html;charset=iso-8859-1\n"
            . "From: Admin <" . $this->from . ">\n";
        $mail = new PHPMailer(); // create a new object
        // TODO: if username and password is empty, read from config file
        $mail->Username = $username;
        $mail->Password = $password;

        $mail->IsHTML(true);
        $mail->IsSMTP(); // enable SMTP
        $mail->SMTPDebug = 1; // debugging: 1 = errors and messages, 2 = messages only
        $mail->SMTPAuth = true; // authentication enabled
        $mail->SMTPSecure = 'ssl'; // secure transfer enabled REQUIRED for Gmail
        $mail->Host = "smtp.gmail.com";
        $mail->Port = 465; // or 587
    }

    public function mail_google($attachment=null, $username="", $password="") {
        $mail = $this->mail;
        $this->gmail_setup($username, $password);
        $mail->SetFrom($this->from);
        $mail->Subject = $this->subject;
        $mail->Body = $this->content;
        $mail->AddAddress($this->to);

        if(!$mail->Send()) {
            echo "Mailer Error: " . $mail->ErrorInfo;
        } else {
            if(!is_null($attachment)) {
                unlink($attachment);
            }
            echo "Message has been sent";
        }
    }

    public function dump() {
        echo "to: " . $this->to; 
        echo "subject: " . $this->subject;
        echo "content: " . $this->content;
        echo "header: " . $this->headers;
    }
}