Automated emails marked spam, Regular emails fine

[geoffism]

Hey everyone

I am using google apps to send emails with my php scripts when i login to my gmail interface for my account and send an email hotmail and live email accepts the email i sent just fine. When i send the exact same email using a php script (shown below) MSN and sometimes google marks the email as junk mail. What am i doing wrong? The domain is clickonlinehomes.com

Thanks

PHP Code:

require_once('phpgmailer/class.phpgmailer.php');
    $mail = new PHPGMailer();
    
    $mail->Username = '$email';
    $mail->Password = '$pass';

                //send welcome email
                $mail->From = '$email';
                    
                $mail->FromName = "$email";
                    
                $mail->Subject = "Welcome to thesite.com";
                    
                $mail->AddAddress("sAmPlE@hotmail.com");
                    
                $mail->Body ="welcome to the site etc...";
                    
                $mail->Send()