问php mail() -作为垃圾邮件发送(使用php邮件器库)

EN

require("class.phpmailer.php");

$mail = new PHPMailer()

$mail->From = "sender@gmail.com";
$mail->AddAddress("recipient@gmail.com");                 // name is optional
$mail->AddReplyTo("sender@gmail.com");

$mail->WordWrap = 50;                                    // set word wrap to 50 characters
$mail->IsHTML(true);                                  // set email format to HTML

$mail->Subject = "Here is the subject";
$mail->Body    = "This is the HTML message body <b>in bold!</b>";
$mail->AltBody = "This is the body in plain text for non-HTML mail clients";

if(!$mail->Send())
{
   echo "Message could not be sent. <p>";
   echo "Mailer Error: " . $mail->ErrorInfo;
   exit;
}

echo "Message has been sent";

//$mail->IsSMTP(); // is this necessary?
//$mail->Host = "some host ip";  // what i need to write here?
//$mail->SMTPAuth = true;     // is this necessary to send email NOT as spam?
//$mail->Username = "test";  // and this?
//$mail->Password = "secret"; // and this?